diff --git a/.gitignore b/.gitignore
index e0267df..717648a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,10 @@
 # build dirs
 bin/
 release/
+build/
 debug/
 
+compile_commands.json
+
 # clangd cache
 .cache/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d5cd436..330f641 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,4 +30,4 @@ add_executable(${PROJECT}
 
 target_link_libraries(${PROJECT} SDL2 SDL2_image SDL2_ttf)
 
-target_include_directories(${PROJECT} PRIVATE "${CMAKE_SOURCE_DIR}/include/" "${CMAKE_SOURCE_DIR}/src/sge/")
+target_include_directories(${PROJECT} PRIVATE "${CMAKE_SOURCE_DIR}/include/" "${CMAKE_SOURCE_DIR}/src/corelib" "${CMAKE_SOURCE_DIR}/src/ui")
diff --git a/compile_commands.json b/compile_commands.json
deleted file mode 100644
index ef03aaa..0000000
--- a/compile_commands.json
+++ /dev/null
@@ -1,22 +0,0 @@
-[
-{
-  "directory": "/home/sara/Documents/c-projects/tabletop/release",
-  "command": "/usr/bin/cc  -I/home/sara/Documents/c-projects/tabletop/include -I/home/sara/Documents/c-projects/tabletop/src/sge -O3 -DNDEBUG -o CMakeFiles/tabletop.dir/src/assets.c.o -c /home/sara/Documents/c-projects/tabletop/src/assets.c",
-  "file": "/home/sara/Documents/c-projects/tabletop/src/assets.c"
-},
-{
-  "directory": "/home/sara/Documents/c-projects/tabletop/release",
-  "command": "/usr/bin/cc  -I/home/sara/Documents/c-projects/tabletop/include -I/home/sara/Documents/c-projects/tabletop/src/sge -O3 -DNDEBUG -o CMakeFiles/tabletop.dir/src/engine.c.o -c /home/sara/Documents/c-projects/tabletop/src/engine.c",
-  "file": "/home/sara/Documents/c-projects/tabletop/src/engine.c"
-},
-{
-  "directory": "/home/sara/Documents/c-projects/tabletop/release",
-  "command": "/usr/bin/cc  -I/home/sara/Documents/c-projects/tabletop/include -I/home/sara/Documents/c-projects/tabletop/src/sge -O3 -DNDEBUG -o CMakeFiles/tabletop.dir/src/game.c.o -c /home/sara/Documents/c-projects/tabletop/src/game.c",
-  "file": "/home/sara/Documents/c-projects/tabletop/src/game.c"
-},
-{
-  "directory": "/home/sara/Documents/c-projects/tabletop/release",
-  "command": "/usr/bin/cc  -I/home/sara/Documents/c-projects/tabletop/include -I/home/sara/Documents/c-projects/tabletop/src/sge -O3 -DNDEBUG -o CMakeFiles/tabletop.dir/src/render.c.o -c /home/sara/Documents/c-projects/tabletop/src/render.c",
-  "file": "/home/sara/Documents/c-projects/tabletop/src/render.c"
-}
-]
\ No newline at end of file
diff --git a/debug b/debug
new file mode 100755
index 0000000..8c12ba3
--- /dev/null
+++ b/debug
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Debug -DCMAKE_EXPORT_COMPILE_COMMANDS=1 && cmake --build build && lldb bin/sim-game -o r -b
diff --git a/release b/release
new file mode 100755
index 0000000..b3daa33
--- /dev/null
+++ b/release
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=1 && cmake --build build && bin/sim-game
diff --git a/src/corelib/assets.c b/src/corelib/assets.c
index d753967..537f864 100644
--- a/src/corelib/assets.c
+++ b/src/corelib/assets.c
@@ -6,12 +6,12 @@
 
 #define NUM_ASSETS 256
 
-void _remove_asset(resource_t*);
+static void _remove_asset(resource_t*);
 
 resource_t g_assets[NUM_ASSETS];
 resource_t* g_assets_endptr = g_assets;
 
-resource_t* insert_asset(const resource_t* resource) {
+static resource_t* insert_asset(const resource_t* resource) {
 	*g_assets_endptr = *resource;
 	resource_t* inserted = g_assets_endptr;
 	++g_assets_endptr;
@@ -95,7 +95,7 @@ resource_t* get_asset(const char* file) {
 	return NULL;
 }
 
-void _delete_referenced_asset(resource_t* res) {
+static void _delete_referenced_asset(resource_t* res) {
 	free(res->name);
 	switch(res->type) {
 	default:
@@ -139,7 +139,7 @@ void clean_assets() {
 	g_assets_endptr = g_assets;
 }
 
-void _remove_asset(resource_t* res) {
+static void _remove_asset(resource_t* res) {
 	_delete_referenced_asset(res);
 	resource_t* last = g_assets_endptr - 1;
 	memmove(res, last, sizeof(resource_t));
diff --git a/src/corelib/render.c b/src/corelib/render.c
index 543e7d1..a144493 100644
--- a/src/corelib/render.c
+++ b/src/corelib/render.c
@@ -9,6 +9,7 @@
 #include "SDL2/SDL_render.h"
 #include "SDL2/SDL_surface.h"
 #include "SDL2/SDL_ttf.h"
+#include <stddef.h>
 
 #define NUM_DRAWCMDS 2048
 
@@ -75,7 +76,8 @@ SDL_FRect get_dest_with_size(SDL_FRect untransformed, int ui) {
 	return r;
 }
 
-void exec_sprite_cmd(const drawcmd_t* cmd) {
+static
+void _exec_sprite_cmd(const drawcmd_t* cmd) {
 	const sprite_t* sprite = &cmd->sprite;
 	float fw, fh, fwm, fhm;
 	get_scaling_factors(&fw, &fh, &fwm, &fhm, cmd->ui);
@@ -94,7 +96,8 @@ void exec_sprite_cmd(const drawcmd_t* cmd) {
 					  &sprite->origin,SDL_FLIP_NONE);
 }
 
-void exec_rect_cmd(const drawcmd_t* cmd) {
+static
+void _exec_rect_cmd(const drawcmd_t* cmd) {
 	float w, h, wm, hm;
 	get_scaling_factors(&w, &h, &wm, &hm, cmd->ui);
 	SDL_FRect rect = (SDL_FRect) {
@@ -134,7 +137,8 @@ void exec_rect_cmd(const drawcmd_t* cmd) {
 	SDL_RenderFillRectF(g_context.renderer, &r);
 }
 
-void exec_sliced_cmd(const drawcmd_t* cmd) {
+static
+void _exec_sliced_cmd(const drawcmd_t* cmd) {
 	const nineslice_t* sliced = &cmd->sliced;
 
 	// target rect in world space
@@ -229,7 +233,8 @@ void exec_sliced_cmd(const drawcmd_t* cmd) {
 	SDL_RenderCopyF(g_context.renderer, t, &srcr, &dstr);
 }
 
-void exec_text_cmd(const drawcmd_t* cmd) {
+static
+void _exec_text_cmd(const drawcmd_t* cmd) {
 	SDL_FRect r = cmd->text.area;
 	int fh = TTF_FontHeight(cmd->text.style.font);
 	int wrap = (int)(fh * r.w / cmd->text.style.size);
@@ -295,14 +300,15 @@ sprite_t render_text(const char* str, SDL_FRect area, text_style_t style) {
 }
 
 typedef void(*drawcmd_delegate)(const drawcmd_t*);
-drawcmd_delegate const drawcmd_funcs[] = {
-	&exec_sprite_cmd,
-	&exec_rect_cmd,
-	&exec_sliced_cmd,
-	&exec_text_cmd,
+static drawcmd_delegate const drawcmd_funcs[] = {
+	&_exec_sprite_cmd,
+	&_exec_rect_cmd,
+	&_exec_sliced_cmd,
+	&_exec_text_cmd,
 };
 
-void exec_buffer() {
+static inline
+void _exec_buffer() {
 	if(d_debug_next_frame) printf("debug capture of draw buffer\ncount: %zu\n", (size_t)(g_drawdata_endptr - g_drawdata));
 	for(const drawcmd_t* cmd = g_drawdata; cmd != g_drawdata_endptr; ++cmd) {
 		if(cmd->type > DRAWCMDTYPE_MIN && cmd->type < DRAWCMDTYPE_MAX) {
@@ -320,12 +326,13 @@ void swap_buffer() {
 	SDL_GetRendererOutputSize(g_context.renderer, &iw, &ih);
 	_render_width = (float)iw; _render_height = (float)ih;
 	_aspect_ratio = _render_height/_render_width;
-	exec_buffer();
+	_exec_buffer();
 	SDL_RenderPresent(g_context.renderer);
 	g_drawdata_endptr = g_drawdata;
 }
 
-void insert_drawcmd_at(size_t index, const drawcmd_t* cmd) {
+static inline
+void _insert_drawcmd_at(size_t index, const drawcmd_t* cmd) {
 	drawcmd_t* insertpoint = g_drawdata + index;
 	drawcmd_t* dest = insertpoint + 1;
 	size_t size = (size_t)(g_drawdata_endptr - g_drawdata);
@@ -337,13 +344,15 @@ void insert_drawcmd_at(size_t index, const drawcmd_t* cmd) {
 			memmove(dest, insertpoint, count*sizeof(drawcmd_t));
 		}
 	}
-	memcpy(insertpoint, cmd, sizeof(drawcmd_t));
+	*insertpoint = *cmd;
 	insertpoint->ui = _render_mode == 1;
 }
 
-void draw(const drawcmd_t* cmd) {
+static inline
+void _draw(const drawcmd_t* cmd) {
 	if(g_drawdata_endptr == g_drawdata) {
-		insert_drawcmd_at(0, cmd);
+		_insert_drawcmd_at(0, cmd);
+		return;
 	}
 	long top = (size_t)(g_drawdata_endptr - g_drawdata),
 		 bot = 0,
@@ -367,7 +376,7 @@ void draw(const drawcmd_t* cmd) {
 		med++;
 		diff = g_drawdata[med].depth - cmd->depth;
 	}
-	insert_drawcmd_at(med, cmd);
+	_insert_drawcmd_at(med, cmd);
 }
 
 void draw_sprite(const sprite_t* sprite) {
@@ -376,7 +385,7 @@ void draw_sprite(const sprite_t* sprite) {
 		.depth=sprite->depth,
 		.sprite=*sprite
 	};
-	draw(&d);
+	_draw(&d);
 }
 
 void draw_rect(const rectshape_t* rect) {
@@ -385,7 +394,7 @@ void draw_rect(const rectshape_t* rect) {
 		.depth=rect->depth,
 		.rect=*rect
 	};
-	draw(&d);
+	_draw(&d);
 }
 
 void draw_sliced(const nineslice_t *sliced) {
@@ -394,7 +403,7 @@ void draw_sliced(const nineslice_t *sliced) {
 		.depth=sliced->depth,
 		.sliced=*sliced
 	};
-	draw(&d);
+	_draw(&d);
 }
 
 void draw_text(const char *str, SDL_FRect area, text_style_t style, depth_t depth) {
@@ -410,7 +419,7 @@ void draw_text(const char *str, SDL_FRect area, text_style_t style, depth_t dept
 		.text=t,
 		.depth=depth,
 	};
-	draw(&d);
+	_draw(&d);
 }
 
 spritesheet_t make_spritesheet(const char *file, int tile_width, int tile_height) {
diff --git a/src/corelib/render.h b/src/corelib/render.h
index 62ce38f..5c71492 100644
--- a/src/corelib/render.h
+++ b/src/corelib/render.h
@@ -89,7 +89,6 @@ extern void screen_to_view(float* x, float* y);
 
 extern void clear_buffer();
 extern void swap_buffer();
-extern void draw(const drawcmd_t* cmd);
 
 extern sprite_t render_text(const char* str, SDL_FRect area, text_style_t style);
 extern void draw_sprite(const sprite_t* sprite);
@@ -104,9 +103,7 @@ extern text_style_t make_text_style(const char* font, SDL_Color color, int dpi,
 extern SDL_Rect get_srcrect_from(spritesheet_t* sheet, int index);
 extern void set_active_view(const view_t* view);
 
-inline sprite_t no_sprite() {
-	return (sprite_t){NULL, 0.0, 0.0, {0.0, 0.0}, 0.0, 0.0, 0.0, 0, {0, 0, 0, 0}};
-}
+#define no_sprite (sprite_t){NULL, 0.0, 0.0, {0.0, 0.0}, 0.0, 0.0, 0.0, 0, {0, 0, 0, 0}}
 
 #ifdef __cplusplus
 }
diff --git a/src/engine.c b/src/engine.c
index f524f90..bdf201a 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -2,31 +2,43 @@
 #include "corelib/assets.h"
 #include "corelib/render.h"
 #include "corelib/input.h"
+#include "time.h"
 
-int engine_start() {
+static float _delta_time = 0;
+static struct timespec start_last_frame;
+
+inline float delta_time() {
+	return _delta_time;
+}
+
+static inline
+int _engine_start() {
 	init_context();
 	return 0;
 }
 
-int engine_shutdown() {
+static inline
+int _engine_shutdown() {
 	game_exit();
 	clean_assets();
 	close_context();
 	exit(0);
 }
 
-void handle_events() {
+static inline
+void _handle_events() {
 	while(SDL_PollEvent(&g_context.event)) {
 		input_event(g_context.event);
 		switch(g_context.event.type) {
-		case SDL_QUIT:
+	case SDL_QUIT:
 			g_context.running = 0;
 			break;
 		}
 	}
 }
 
-int engine_run() {
+static inline
+int _engine_run() {
 	SDL_Window* window = SDL_CreateWindow("Tabletop", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 420, SDL_WINDOW_FULLSCREEN_DESKTOP);
 
 	g_context = (context_t){
@@ -37,9 +49,15 @@ int engine_run() {
 
 	load_game();
 	start_game();
-
+	
+	timespec_get(&start_last_frame, TIME_UTC);
+	struct timespec next_time;
 	while(g_context.running) {
-		handle_events();
+		timespec_get(&next_time, TIME_UTC);
+		_delta_time = (next_time.tv_nsec - start_last_frame.tv_nsec) * 1E-9;
+		if(next_time.tv_nsec < start_last_frame.tv_nsec) _delta_time = 0;
+		start_last_frame = next_time;
+		_handle_events();
 		_render_mode = 1;
 		update_ui();
 		_render_mode = 0;
@@ -50,7 +68,7 @@ int engine_run() {
 }
 
 int main(int argc, char* argv[]) {
-	engine_start();
-	engine_run();
-	engine_shutdown();
+	_engine_start();
+	_engine_run();
+	_engine_shutdown();
 }
diff --git a/src/engine.h b/src/engine.h
index fa546de..ada21c4 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -1,6 +1,12 @@
 #ifndef _engine_h
 #define _engine_h
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern float delta_time();
+
 /* TO BE DEFINED IN GAME */
 
 extern void load_game();
@@ -9,4 +15,8 @@ extern void start_game();
 extern void update_game();
 extern void update_ui();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _engine_h */
diff --git a/src/game.c b/src/game.c
index 2e442fd..c2feec3 100644
--- a/src/game.c
+++ b/src/game.c
@@ -1,53 +1,16 @@
 #include "engine.h"
-#include "tilemap.h"
+#include "world.h"
+#include "player.h"
 #include "corelib/input.h"
 #include "corelib/render.h"
 #include "corelib/assets.h"
 #include "corelib/layers.h"
 #include "SDL2/SDL_mouse.h"
 #include "SDL2/SDL_scancode.h"
-#include "ui.h"
 
-int cursor_tile = 1;
 int dragging = 0;
 int drawing = 0;
-sprite_t cursor;
 spritesheet_t world_sheet;
-tileset_t tileset;
-tilemap_t tilemap = {
-	.width = 0,.height = 0,
-	.x=0,.y=0
-};
-
-void on_save_key(int down) {
-	if(down) save_tilemap(&tilemap, "tilemap.csv");
-}
-
-void on_load_key(int down) {
-	if(down) load_tilemap(&tilemap, "tilemap.csv");
-}
-
-void on_clear_key(int down) {
-	if(down) {
-		for(int i = 0; i < tilemap.height * tilemap.width; ++i) {
-			tilemap.tiles[i] = 0;
-		}
-	}
-}
-
-void on_cycle_tile(int axis) {
-	cursor_tile += axis;
-	if(cursor_tile <= 0) {
-		cursor_tile = 1;
-	}
-	int size = tileset.size;
-	if(cursor_tile >= size) {
-		cursor_tile = size-1;
-	}
-	if(tileset.size >= cursor_tile && 0 < cursor_tile) {
-		cursor = tileset.set[cursor_tile-1].sprite;
-	}
-}
 
 void on_quit_key(int down) {
 	if(down) {
@@ -92,51 +55,11 @@ void on_scroll_zoom(float delta) {
 }
 
 void load_game() {
-	style.button.button = style.button.active = make_nineslice("button.png", 126, 0.01);
 	world_sheet = make_spritesheet("tileset.png", 189, 189);
 
-	tileset.set = (tile_t*)calloc(21, sizeof(tile_t));
-	tileset.size = 21;
-	tileset.set[0] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 0),.walkable=0};
-	tileset.set[1] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 1),.walkable=0};
-	tileset.set[2] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 2),.walkable=0};
-
-	tileset.set[3] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 10),.walkable=0};
-	tileset.set[4] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 11),.walkable=0};
-	tileset.set[5] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 12),.walkable=0};
-
-	tileset.set[6] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 20),.walkable=0};
-	tileset.set[7] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 21),.walkable=0};
-	tileset.set[8] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 22),.walkable=0};
-
-	tileset.set[9] = (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 30),.walkable=1};
-	tileset.set[10]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 31),.walkable=1};
-	tileset.set[11]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 32),.walkable=1};
-
-	tileset.set[12]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 3),.walkable=1};
-	tileset.set[13]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 4),.walkable=1};
-	tileset.set[14]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 5),.walkable=1};
-
-	tileset.set[15]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 13),.walkable=1};
-	tileset.set[16]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 14),.walkable=1};
-	tileset.set[17]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 15),.walkable=1};
-
-	tileset.set[18]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 23),.walkable=1};
-	tileset.set[19]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 24),.walkable=1};
-	tileset.set[20]= (tile_t){.sprite=sprite_from_spritesheet(&world_sheet, 25),.walkable=1};
-
-	// register calloc'd array to be deleted with free(...)
-	add_arbitrary_asset(tileset.set, &free);
-
-	tilemap.width = tilemap.height = 128;
-	on_cycle_tile(0);
-
 	input_init();
-	add_key_listener(SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_W, &on_save_key);
-	add_key_listener(SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_R, &on_load_key);
-	add_key_listener(SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_C, &on_clear_key);
+	world_clear();
 	add_key_listener(SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_Q, &on_quit_key);
-	add_key_listener(SDL_SCANCODE_A, SDL_SCANCODE_D, &on_cycle_tile);
 	add_key_listener(SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_TAB, &on_debug_frame);
 	add_key_listener(SDL_SCANCODE_MINUS, SDL_SCANCODE_EQUALS, &on_button_zoom);
 	add_mouse_button_listener(SDL_BUTTON_LMASK, &on_click);
@@ -144,94 +67,24 @@ void load_game() {
 	add_mouse_button_listener(SDL_BUTTON_MMASK, &on_middle_mouse);
 	add_mouse_listener(&on_drag_world);
 	add_scroll_listener(&on_scroll_zoom);
+
+	create_player();
 }
 
 void start_game() {
 	g_active_view.width = 21;
-	on_clear_key(1);
 }
 
 void update_game() {
 	if(drawing == 1) {
 		drawing = 2;
 	}
-
-	float fx, fy;
-	mouse_world_position(&fx, &fy);
-	cursor.x = floor(fx); cursor.y = floor(fy);
-	if(drawing) {
-		int x, y;
-		x = floorf(fx);
-		y = floorf(fy);
-		if(x >= 0 && y >= 0 && x < tilemap.width && y < tilemap.height) {
-			if(drawing > 0) {
-				set_tile(&tilemap, x, y, cursor_tile);
-			} else {
-				set_tile(&tilemap, x, y, 0);
-			}
-		}
-	}
-
-	rectshape_t world_outline = {
-		tilemap.x, tilemap.y, (float)tilemap.width, (float)tilemap.height,
-		0.01f, RLAYER_TILEMAP-1, {0,0,0,0}, {255, 255, 255, 255}
-	};
-	rectshape_t cursor_outline = {
-		cursor.x, cursor.y, 1.0f, 1.0f, 0.01f, RLAYER_SPRITES-1,
-		{0, 0, 0, 0}, {255, 255, 255, 255}
-	};
-
-	draw_rect(&world_outline);
-	draw_rect(&cursor_outline);
-	draw_sprite(&cursor);
-	draw_tilemap(&tilemap, &tileset);
+	update_objects();
+	draw_objects();
 }
 
 void update_ui() {
 	update_input();
-
-	nineslice_t sliced = style.button.active;
-	sliced.rect = (SDL_FRect){0, 0.25f, 0.2, 0.05};
-	sliced.depth = RLAYER_UI - 20;
-	draw_sliced(&sliced);
-
-	const int offset_selected = cursor_tile - 1;
-
-	rectshape_t selected_tile_rect = (rectshape_t) {
-		offset_selected * 0.015f, 0.f, 0.015f, 0.015f, 0.001f, RLAYER_UI-10,
-		{0,0,0,0}, {255, 255, 255, 255}
-	};
-	draw_rect(&selected_tile_rect);
-
-	rectshape_t shape = (rectshape_t) {
-		0.0f, 0.0f, 1.f, 0.015f, 0, RLAYER_UI,
-		{100,100,100,255}, {0,0,0,0}
-	};
-	draw_rect(&shape);
-	text_style_t style = make_text_style("ui_font.otf", 100, 0.01);
-	draw_text("M",
-			(SDL_FRect){0.0, 0.0, 10.0, 10.0}, style, (SDL_Color){255, 255, 255, 255}, RLAYER_UI - 100);
-
-	float mx, my;
-	mouse_screen_position(&mx, &my);
-	for(int i = 0; i < tileset.size; ++i) {
-		// make a copy of the reference sprite and adjust it to fit the ui
-		sprite_t sprite = tileset.set[i].sprite;
-		sprite.depth = RLAYER_UI-5;
-		sprite.x = i * 0.015f; sprite.y = 0;
-		sprite.sx = 0.015f; sprite.sy = 0.015f;
-		float amx=mx-sprite.x, amy=my-sprite.y;
-		draw_sprite(&sprite);
-
-		// allow user to select tiles with mouse
-		if(amx >= 0 && amy >= 0 && amx < sprite.sx && amy < sprite.sy) {
-			if(drawing == 1) {
-				drawing = 0;
-				cursor_tile = i+1;
-				on_cycle_tile(0);
-			}
-		}
-	}
 }
 
 void game_exit() {}
diff --git a/src/player.c b/src/player.c
new file mode 100644
index 0000000..4fada2e
--- /dev/null
+++ b/src/player.c
@@ -0,0 +1,41 @@
+#include "player.h"
+#include "layers.h"
+#include "world.h"
+#include "input.h"
+#include "engine.h"
+#include <SDL2/SDL_scancode.h>
+
+float player_move_x = 0;
+float player_move_y = 0;
+float player_xv = 0;
+float player_yv = 0;
+object_t* player_instance = NULL;
+
+void player_update(object_t *object) {
+	float m = sqrtf(player_move_x*player_move_x + player_move_y*player_move_y);
+	if(m == FP_NAN) m = 1;
+	m = 1.f/m;
+	player_xv = player_move_x * 3.f * m,
+	player_yv = player_move_y * 3.f * m;
+	object->sprite.x += player_xv * delta_time();
+	object->sprite.y += player_yv * delta_time();
+}
+
+object_t* create_player() {
+	player_instance = make_object();
+	player_instance->evt_update = &player_update;
+	player_instance->sprite = make_sprite("player.png", 0, 0);
+
+	add_key_listener(SDL_SCANCODE_A, SDL_SCANCODE_D, &player_axis_horizontal);
+	add_key_listener(SDL_SCANCODE_S, SDL_SCANCODE_W, &player_axis_vertical);
+
+	return player_instance;
+}
+
+void player_axis_horizontal(int axis) {
+	player_move_x = axis;
+}
+
+void player_axis_vertical(int axis) {
+	player_move_y = -axis;
+}
diff --git a/src/player.h b/src/player.h
new file mode 100644
index 0000000..3f116e9
--- /dev/null
+++ b/src/player.h
@@ -0,0 +1,16 @@
+#ifndef _player_h
+#define _player_h
+
+struct object_t;
+
+extern float player_move_x, player_move_y,
+			 player_xv, player_yv;
+extern struct object_t* player_instance;
+
+void player_update(struct object_t* object);
+struct object_t* create_player();
+
+extern void player_axis_horizontal(int axis);
+extern void player_axis_vertical(int axis);
+
+#endif /* _player_h */
diff --git a/src/tilemap.c b/src/tilemap.c
deleted file mode 100644
index ef9ce4d..0000000
--- a/src/tilemap.c
+++ /dev/null
@@ -1,82 +0,0 @@
-#include "tilemap.h"
-#include "corelib/layers.h"
-#include "stdio.h"
-#include "string.h"
-#include "signal.h"
-#include "stdio.h"
-
-void draw_tilemap(const tilemap_t* tilemap, const tileset_t* tileset) {
-	sprite_t sprite;
-	for(int y=0;y<tilemap->height;++y) {
-		for(int x=0;x<tilemap->width;++x) {
-			size_t index = get_tile(tilemap, x, y);
-			if(index == 0) continue;
-			const tile_t tile = tileset->set[index-1];
-			sprite = tile.sprite;
-			sprite.depth = RLAYER_TILEMAP;
-			sprite.x = x; sprite.y = y;
-			draw_sprite(&sprite);
-		}
-	}
-}
-
-int save_tilemap(const tilemap_t* map, const char* file) {
-	FILE* fs = fopen(file, "w");
-	if(fs == NULL) {
-		fprintf(stderr, "ERROR: Failed to open file %s\n", file);
-		return 1;
-	}
-	fprintf(fs, "%d,%d,", map->width, map->height);
-	for(int i = 0; i < map->width * map->height; ++i)
-		fprintf(fs,"%zu,", map->tiles[i]);
-	fclose(fs);
-	return 0;
-}
-
-int load_tilemap(tilemap_t* map, const char* file) {
-	FILE* fs = fopen(file, "r");
-	if(fs == NULL) {
-		fprintf(stderr, "ERROR: Failed to open file %s\n", file);
-		return 1;
-	}
-	char buf[99];
-	char* writer = buf;
-	int n = 0;
-	size_t* tile = map->tiles;
-	int entries=0;
-	while(1) {
-		n = fgetc(fs);
-		const char c = (char)n;
-		switch(n) {
-			case ' ':
-			case '\n':
-			case '\t':
-				break; // ignore
-			case EOF:
-			case ',':
-				*writer = '\0';
-				if(entries == 0) {
-					map->width = atoi(buf);
-				} else if(entries == 1) {
-					map->height = atoi(buf);
-				} else {
-					if(entries-2 >= TILEMAP_MAX_SIZE) goto end_while;
-					*tile = (size_t)atoi(buf);
-					++tile;
-				}
-				writer = buf;
-				++entries;
-				if(n == EOF)
-					goto end_while;
-				else
-					break;
-			default:
-				*writer = c;
-				++writer;
-				break;
-		}
-	}
-end_while:
-	fclose(fs);
-	return 0;
-}
diff --git a/src/tilemap.h b/src/tilemap.h
deleted file mode 100644
index 478bebd..0000000
--- a/src/tilemap.h
+++ /dev/null
@@ -1,41 +0,0 @@
-#ifndef _tilemap_h
-#define _tilemap_h
-
-#include "corelib/render.h"
-
-#define TILEMAP_MAX_SIZE 16384
-#define TILESET_MAX_SIZE 255
-
-typedef struct tile_t {
-	sprite_t sprite;
-	short walkable;
-} tile_t;
-
-typedef struct tileset_t {
-	tile_t* set;
-	size_t size;
-} tileset_t;
-
-typedef struct tilemap_t {
-	size_t tiles[TILEMAP_MAX_SIZE];
-	int width, height;
-	float x, y;
-} tilemap_t;
-
-static inline int get_tilemap_index(const tilemap_t* tilemap, int x, int y) {
-	return x + y * tilemap->width;
-}
-static inline size_t get_tile(const tilemap_t* tilemap, int x, int y) {
-	return *(tilemap->tiles + get_tilemap_index(tilemap, x, y));
-}
-static inline void set_tile(tilemap_t* tilemap, int x, int y, size_t value) {
-	*(tilemap->tiles + get_tilemap_index(tilemap, x, y)) = value;
-}
-
-extern void draw_tilemap(const tilemap_t* tilemap, const tileset_t* tileset);
-/*load csv tilemap from file*/
-extern int load_tilemap(tilemap_t* tilemap, const char* file);
-/*write csv tilemap to file*/
-extern int save_tilemap(const tilemap_t* tilemap, const char* file);
-
-#endif /* _tilemap_h */
diff --git a/src/world.c b/src/world.c
new file mode 100644
index 0000000..6f62c91
--- /dev/null
+++ b/src/world.c
@@ -0,0 +1,60 @@
+#include "world.h"
+
+object_t g_objects[WORLD_NUM_OBJECTS];
+
+void world_clear() {
+	for(int i = 0; i < WORLD_NUM_OBJECTS; ++i) {
+		g_objects[i].active = 0;
+		g_objects[i].enabled = 0;
+	}
+}
+
+void object_draw_sprite(object_t* object) {
+	draw_sprite(&object->sprite);
+}
+
+object_t* _find_free_object() {
+	for(int i = 0; i < WORLD_NUM_OBJECTS; ++i) {
+		if(g_objects[i].active == 0) {
+			return g_objects + i;
+		}
+	}
+	return NULL;
+}
+
+object_t* make_object() {
+	object_t* o = _find_free_object();
+	o->active = 1;
+	o->enabled = 1;
+	o->evt_draw = &object_draw_sprite;
+	o->evt_update = NULL;
+	memset(&o->sprite, 0, sizeof(sprite_t));
+	return o;
+}
+
+object_t* instantiate_object(const object_t *original) {
+	object_t* obj = make_object();
+	*obj = *original;
+	obj->active = 1;
+	return obj;
+}
+
+void update_objects() {
+	for(int i = 0; i < WORLD_NUM_OBJECTS; ++i) {
+		if(g_objects[i].active == 1
+		&& g_objects[i].enabled == 1
+		&& g_objects[i].evt_update != NULL) {
+			g_objects[i].evt_update(g_objects + i);
+		}
+	}
+}
+
+void draw_objects() {
+	for(int i = 0; i < WORLD_NUM_OBJECTS; ++i) {
+		if(g_objects[i].active == 1
+		&& g_objects[i].enabled == 1
+		&& g_objects[i].evt_draw != NULL) {
+			g_objects[i].evt_draw(g_objects + i);
+		}
+	}
+}
diff --git a/src/world.h b/src/world.h
new file mode 100644
index 0000000..2fd381d
--- /dev/null
+++ b/src/world.h
@@ -0,0 +1,37 @@
+#ifndef _world_h
+#define _world_h
+
+#include "render.h"
+#include <stdint.h>
+
+#define WORLD_NUM_OBJECTS 255
+
+typedef struct object_t object_t;
+
+typedef void(*tick_fn)(struct object_t*);
+typedef void(*draw_fn)(struct object_t*);
+
+struct object_t {
+	sprite_t sprite;
+	int active; // 1 if this object is in use and should not be overriden
+	int enabled; // 1 if this object's events should be triggered
+
+	uintptr_t timer; // free to use for whatever
+
+	tick_fn evt_update;
+	draw_fn evt_draw;
+};
+
+extern object_t g_objects[WORLD_NUM_OBJECTS];
+
+void world_clear();
+
+object_t* make_object();
+object_t* instantiate_object(const object_t* original);
+
+void object_draw_sprite(object_t* object);
+
+void update_objects();
+void draw_objects();
+
+#endif /* _world_h */
diff --git a/tilemap.csv b/tilemap.csv
deleted file mode 100644
index 859be96..0000000
--- a/tilemap.csv
+++ /dev/null
@@ -1 +0,0 @@
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