diff --git a/graphics/truck.ase b/graphics/truck.ase
index b473881..cfb71a5 100644
Binary files a/graphics/truck.ase and b/graphics/truck.ase differ
diff --git a/resources/truck.png b/resources/truck.png
index 75f4a46..f74a107 100644
Binary files a/resources/truck.png and b/resources/truck.png differ
diff --git a/src/core/assets/asset_db.cpp b/src/core/assets/asset_db.cpp
index 6fbc03e..615faa6 100644
--- a/src/core/assets/asset_db.cpp
+++ b/src/core/assets/asset_db.cpp
@@ -29,9 +29,7 @@ void AssetDB::load(std::string asset_name) {
 }
 
 void AssetDB::index_assets() {
-    SDL_Log("Indexing assets");
     for(std::filesystem::directory_entry const &itr : std::filesystem::recursive_directory_iterator("resources")) {
-        SDL_Log("Indexing %s", itr.path().c_str());
         if(itr.is_directory())
             continue;
         else if(!itr.path().has_extension())
@@ -43,7 +41,6 @@ void AssetDB::index_assets() {
                 SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Failed to add asset %s, asset by that name is already indexed", name.c_str());
             } else {
                 this->assets.insert({name, std::make_shared<Texture>(itr.path())});
-                SDL_Log("Indexed resource %s as texture", name.c_str());
             }
         }
     }
diff --git a/src/core/collision.cpp b/src/core/collision.cpp
index 14c0791..b256b92 100644
--- a/src/core/collision.cpp
+++ b/src/core/collision.cpp
@@ -39,7 +39,7 @@ void CollisionWorld::check_collisions_for(CollisionShape *shape, std::vector<Col
     // (As the shapes *before* have already been checked, guaranteeing that each pair will only be checked once)
     for(std::vector<CollisionShape*>::iterator iter{begin}; iter != this->shapes.end(); ++iter) {
         CollisionShape *other{*iter};
-        if(other != shape && CollisionShape::shapes_overlap(shape, other)) {
+        if(other != shape && other->get_owner() != shape->get_owner() && CollisionShape::shapes_overlap(shape, other)) {
             if((shape->get_mask() & other->get_layers()) != 0x0u)
                 shape->get_owner()->add_overlap(shape, other);
             if((shape->get_layers() & other->get_mask()) != 0x0u)
diff --git a/src/core/collision_shape.cpp b/src/core/collision_shape.cpp
index a1ca256..3b96849 100644
--- a/src/core/collision_shape.cpp
+++ b/src/core/collision_shape.cpp
@@ -24,13 +24,16 @@ Shape Shape::make_box(float h_extent, float v_extent) {
     };
 }
 
-CollisionShape::CollisionShape(std::string const &name, Node *owner, Shape shape)
+CollisionShape::CollisionShape(std::string const &name, Shape shape)
 : Node2D(name)
-, world{CanvasEngine::get_singleton()->get_collision_world()} {
-    this->shape = shape;
-}
+, world{CanvasEngine::get_singleton()->get_collision_world()}
+, shape{shape} {}
 
 void CollisionShape::_added() {
+    this->ce::Node2D::_added();
+    ce::Transform transform{this->get_global_transform()};
+    if(!this->is_inside_tree())
+        return;
     Node *parent{this->get_parent()};
     while(parent != nullptr) {
         if(CollidableNode *as_collidable{dynamic_cast<CollidableNode*>(parent)}) {
@@ -40,16 +43,18 @@ void CollisionShape::_added() {
         }
     }
     SDL_LogError(SDL_LOG_CATEGORY_ERROR, "%s does not have a parent that is a CollidableNode to serve as the owner", this->get_name().c_str());
-    #ifdef DEBUG
-        abort();
-    #endif
     if(this->is_registered)
         this->deregister_with_world();
+#ifdef DEBUG
+    abort();
+#endif
 }
 
 void CollisionShape::_removed() {
-    if(this->is_registered)
+    this->ce::Node2D::_removed();
+    if(this->is_registered) {
         this->deregister_with_world();
+    }
 }
 
 bool CollisionShape::can_collide(CollisionShape const *lhs, CollisionShape const *rhs) {
@@ -71,9 +76,9 @@ bool CollisionShape::shapes_overlap(CollisionShape const *lhs, CollisionShape co
             ? overlap_circle_circle(lshape.circle, lhst, rshape.circle, rhst)
             : overlap_circle_aabb(lshape.circle, lhst, rshape.box, rhst);
     } else if(lhs->shape.shape == Shape::AABB) {
-        return rhs->shape.shape == Shape::CIRCLE
-            ? overlap_circle_aabb(rshape.circle, rhst, lshape.box, lhst)
-            : overlap_aabb_aabb(lshape.box, lhst, rshape.box, rhst);
+        return rhs->shape.shape == Shape::AABB
+            ? overlap_aabb_aabb(lshape.box, lhst, rshape.box, rhst)
+            : overlap_circle_aabb(lshape.circle, lhst, rshape.box, rhst);
     } else {
         SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Attempt to compare shapes with a shape that is not of a valid shape. This should never happen.");
         #ifdef DEBUG
@@ -97,16 +102,9 @@ bool CollisionShape::overlap_circle_aabb(ShapeCircle lhs, Transform lhst, ShapeA
 }
 
 bool CollisionShape::overlap_aabb_aabb(ShapeAABB lhs, Transform lhst, ShapeAABB rhs, Transform rhst) {
-    // calculate size of bounding box encompassing both. If it's smaller than the size of both summed, the two are overlapping.
-    float const bound_x{std::max({
-        std::abs((lhst.position.x - lhs.h_extent) - (rhst.position.x + rhs.h_extent)),
-        lhs.h_extent, rhs.h_extent
-    })};
-    float const bound_y{std::max({
-        std::abs((lhst.position.y - lhs.v_extent) - (rhst.position.y + rhs.v_extent)),
-        lhs.v_extent, rhs.v_extent
-    })};
-    return bound_x < (lhs.h_extent + rhs.h_extent) && bound_y < (lhs.v_extent + rhs.v_extent);
+    ce::Vecf const diff{lhst.position - rhst.position};
+    return std::abs(diff.x) <= (lhs.h_extent + rhs.h_extent)
+        && std::abs(diff.y) <= (lhs.v_extent + rhs.v_extent);
 }
 
 CollidableNode *CollisionShape::get_owner() const {
diff --git a/src/core/collision_shape.hpp b/src/core/collision_shape.hpp
index 2debd46..80c80b1 100644
--- a/src/core/collision_shape.hpp
+++ b/src/core/collision_shape.hpp
@@ -29,7 +29,7 @@ class CollisionShape : public Node2D {
     CollisionWorld &world;
     bool is_registered{false};
 public:
-    CollisionShape(std::string const &name, Node *owner, Shape shape);
+    CollisionShape(std::string const &name, Shape shape);
 
     virtual void _added() override;
     virtual void _removed() override;
diff --git a/src/core/level.cpp b/src/core/level.cpp
index fde5b59..25dbd03 100644
--- a/src/core/level.cpp
+++ b/src/core/level.cpp
@@ -17,6 +17,7 @@ void Level::deinstantiate() {
 
 void Level::propagate_tick(double const &delta_time) {
     this->root->propagate_tick(delta_time);
+    this->root->propagate_post_tick();
 }
 
 void Level::propagate_draw(SDL_Renderer *render) {
diff --git a/src/core/math/vector.cpp b/src/core/math/vector.cpp
index 843de6e..fbd4c2f 100644
--- a/src/core/math/vector.cpp
+++ b/src/core/math/vector.cpp
@@ -71,6 +71,12 @@ bool Vecf::is_nan() const {
     return std::isnan(this->x) || std::isnan(this->y);
 }
 
+Vecf Vecf::clamp_magnitude(float max) const {
+    float const old_magnitude{this->magnitude()};
+    float const new_magnitude{std::min(max, old_magnitude)};
+    return (old_magnitude != 0.f ? ((*this) / old_magnitude) : ce::Vecf::ZERO) * new_magnitude;
+}
+
 void Vecf::scale(float x, float y) {
     this->x *= x;
     this->y *= y;
diff --git a/src/core/math/vector.hpp b/src/core/math/vector.hpp
index a299ad9..13f5db6 100644
--- a/src/core/math/vector.hpp
+++ b/src/core/math/vector.hpp
@@ -37,6 +37,7 @@ struct Vecf {
     //! returns true if either the x or y element is NaN
     bool is_nan() const;
 
+    Vecf clamp_magnitude(float max) const;
     //! scale vector member-wise
     void scale(float x, float y);
     //! scale vector member-wise
@@ -62,20 +63,20 @@ bool operator==(Vecf const &lhs, Vecf const &rhs) {
 
 static inline
 Vecf operator+(Vecf const &lhs, Vecf const &rhs) {
-    return Vecf(lhs.x + rhs.x, lhs.y + rhs.y);
+    return Vecf{lhs.x + rhs.x, lhs.y + rhs.y};
 }
 
 static inline
 Vecf operator-(Vecf const &lhs, Vecf const &rhs) {
-    return Vecf(lhs.x - rhs.x, lhs.y - rhs.y);
+    return Vecf{lhs.x - rhs.x, lhs.y - rhs.y};
 }
 static inline
 Vecf operator*(Vecf const &v, float f) {
-    return Vecf(v.x * f, v.y * f);
+    return Vecf{v.x * f, v.y * f};
 }
 static inline
 Vecf operator/(Vecf const &v, float f) {
-    return Vecf(v.x / f, v.y / f);
+    return Vecf{v.x / f, v.y / f};
 }
 
 static inline
diff --git a/src/core/node.cpp b/src/core/node.cpp
index 2e9d965..8b109f0 100644
--- a/src/core/node.cpp
+++ b/src/core/node.cpp
@@ -1,5 +1,6 @@
 #include "node.hpp"
 #include <SDL2/SDL_assert.h>
+#include <SDL2/SDL.h>
 #include <algorithm>
 #include <cassert>
 #include <utility>
@@ -52,8 +53,6 @@ void Node::set_name(std::string const &name) {
 
 void Node::flag_for_deletion() {
     this->request_deletion = true;
-    this->tick = false;
-    this->visible = false;
 }
 
 bool Node::requests_deletion() const {
@@ -84,6 +83,10 @@ bool Node::is_inside_tree() const {
     return this->inside_tree;
 }
 
+Node::ChildrenVector &Node::get_children() {
+    return this->children;
+}
+
 void Node::set_level(ce::Level *level) {
     // parent level needs to match
     assert(this->parent == nullptr || this->parent->get_level() == level);
@@ -136,12 +139,12 @@ void Node::propagate_tick(double const &delta_time) {
 
 void Node::propagate_post_tick() {
     // clean up children queued for deletion
-    for(size_t i{0}; i < this->children.size(); ++i) {
+    for(size_t i{0}; i < this->children.size();) {
         ChildrenVector::value_type &value{this->children[i]};
         if(value.second->requests_deletion()) {
-            value.second->propagate_removed();
-            this->child_removed.invoke(value.second.get());
+            this->remove_child(value.second.get());
         } else {
+            ++i;
             value.second->propagate_post_tick();
         }
     }
diff --git a/src/core/node.hpp b/src/core/node.hpp
index 659a15c..49179fc 100644
--- a/src/core/node.hpp
+++ b/src/core/node.hpp
@@ -34,7 +34,7 @@ public:
 public:
     Node(std::string name);
     virtual ~Node();
-protected:
+public:
     virtual void _added() {} //!< called the moment after the object is added as a child to another node
     virtual void _first_tick() {} //!< called the first frame this object is active
     virtual void _tick(double const &delta_time [[maybe_unused]]) {} //!< called every frame
@@ -57,6 +57,7 @@ public:
     bool is_ticking() const;
     ce::Level *get_level() const;
     bool is_inside_tree() const;
+    ChildrenVector &get_children();
 private:
     void set_level(ce::Level *level);
     void set_is_inside_tree(bool value);
diff --git a/src/core/node2d.cpp b/src/core/node2d.cpp
index aa9b9ce..01d9fd6 100644
--- a/src/core/node2d.cpp
+++ b/src/core/node2d.cpp
@@ -6,6 +6,7 @@ Node2D::Node2D(std::string name) : Node(name) {}
 
 void Node2D::_added() {
     this->parent_node2d = dynamic_cast<Node2D*>(this->get_parent());
+    this->_update_transform();
 }
 
 void Node2D::_update_transform() {
@@ -13,6 +14,8 @@ void Node2D::_update_transform() {
         this->global_transform = this->transform * this->parent_node2d->get_global_transform();
     else
         this->global_transform = this->transform;
+    for(ChildrenVector::value_type &pair : this->get_children())
+        pair.second->_update_transform();
 }
 
 void Node2D::set_transform(Transform const &transform) {
@@ -30,10 +33,11 @@ void Node2D::set_global_transform(Transform transform) {
         Transform parent = this->parent_node2d->get_global_transform();
         transform.position -= parent.position.rotated(-parent.rotation);
         transform.scale_by(parent.scale.reciprocal());
-        assert(transform.scale.x != 0.f || transform.scale.y != 0.f); // !!!
+        assert(transform.scale.x != 0.f || transform.scale.y != 0.f);
         transform.rotation -= parent.rotation;
     }
     this->transform = transform;
+    this->_update_transform();
 }
 
 Transform const &Node2D::get_global_transform() const {
diff --git a/src/level_1.cpp b/src/level_1.cpp
index 75fd8fc..1cd5455 100644
--- a/src/level_1.cpp
+++ b/src/level_1.cpp
@@ -13,6 +13,6 @@ ce::Node::OwnedPtr Level1::construct() {
         .scale = ce::Vecf::ONE
     });
     root->create_child<Player>();
-    root->create_child<Truck>(0.f);
+    root->create_child<Truck>(true);
     return std::move(root);
 }
diff --git a/src/main.cpp b/src/main.cpp
index a96628c..f3ccfa2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,9 +1,11 @@
 #include "core/canvas_engine.hpp"
 #include "level_1.hpp"
+#include <SDL2/SDL_log.h>
 
 ce::CanvasEngine engine{};
 
 int main(int argc [[maybe_unused]], char* argv [[maybe_unused]][]) {
+    SDL_LogSetAllPriority(SDL_LOG_PRIORITY_VERBOSE);
     std::unique_ptr<ce::Level> level{std::make_unique<Level1>()};
     engine.run(level);
 }
diff --git a/src/player.cpp b/src/player.cpp
index 9dd6bb5..9f6112d 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -10,11 +10,15 @@
 #include "truck.hpp"
 #include <SDL2/SDL_keyboard.h>
 #include <SDL2/SDL_keycode.h>
+#include <cmath>
 
 Player::Player()
 : ce::CollidableNode("player", 0x1u, 0x1u)
 , sprite{this->create_child<ce::Sprite>("bike", "bike")}
-, shape{this->create_child<ce::CollisionShape>("player_col_shape", this, ce::Shape::make_box(1.f, 2.f))} {
+, shape{this->create_child<ce::CollisionShape>("player_col_shape", ce::Shape::make_box(.4f, 0.75f))} {
+    this->set_global_transform(this->get_global_transform()
+        .translated({0.f, 2.f})
+    );
     this->sprite->set_global_transform(this->sprite->get_global_transform()
         .scaled({1.5f, 1.5f})
     );
@@ -24,9 +28,7 @@ Player::Player()
             new ce::KeyboardScancode(SDL_SCANCODE_A),
             new ce::KeyboardScancode(SDL_SCANCODE_D)
         )
-    })
-    .changed
-    .connect(ce::Callable<void, ce::InputValue>::make(
+    }).changed.connect(ce::Callable<void, ce::InputValue>::make(
         this, &Player::_input_horizontal_movement)
     );
     map.bind_input("vertical", {
@@ -34,12 +36,12 @@ Player::Player()
             new ce::KeyboardScancode(SDL_SCANCODE_W),
             new ce::KeyboardScancode(SDL_SCANCODE_S)
         )
-    })
-    .changed
-    .connect(ce::Callable<void, ce::InputValue>::make(
+    }) .changed.connect(ce::Callable<void, ce::InputValue>::make(
         this, &Player::_input_vertical_movement)
     );
-    this->overlap_enter.connect(ce::Callable<void, ce::CollisionShape *, ce::CollidableNode *, ce::CollisionShape *>::make(this, &Player::_on_overlap_enter));
+    this->overlap_enter.connect(ce::Callable<void, ce::CollisionShape *, ce::CollidableNode *, ce::CollisionShape *>::make(
+        this, &Player::_on_overlap_enter
+    ));
 }
 
 void Player::_tick(double const &delta) {
@@ -49,9 +51,17 @@ void Player::_tick(double const &delta) {
         ACCELERATION * delta
     );
     ce::Transform trans{this->get_global_transform().translated(this->velocity * delta)};
-    trans.position.x = std::clamp(trans.position.x, -3.f, 3.f);
-    trans.position.y = std::clamp(trans.position.y, -2.f, 2.f);
+    trans.position.x = std::clamp(trans.position.x, -LIMITS.x, LIMITS.x);
+    trans.position.y = std::clamp(trans.position.y, -LIMITS.y, LIMITS.y);
     this->set_global_transform(trans);
+
+    if(this->invincibility > 0.f) {
+        this->invincibility -= delta;
+        this->sprite->set_visible(this->invincibility <= 0.f
+            ? true
+            : int(std::floorf(this->invincibility / DAMAGE_FLASH_FREQ)) % 2 != 0
+        );
+    }
 }
 
 void Player::_input_horizontal_movement(ce::InputValue value) {
@@ -63,9 +73,10 @@ void Player::_input_vertical_movement(ce::InputValue value) {
 }
 
 void Player::_on_overlap_enter(ce::CollisionShape *, ce::CollidableNode *other, ce::CollisionShape *) {
+    if(this->invincibility > 0.f)
+        return;
     if(Truck *truck{dynamic_cast<Truck*>(other)}) {
-        // TODO: Implement damage
-        this->flag_for_deletion();
+        this->invincibility = 2.f;
+        this->velocity = (this->get_global_transform().position - other->get_global_transform().position).normalized() * DAMAGE_FORCE;
     }
-    SDL_Log("overlap");
 }
diff --git a/src/player.hpp b/src/player.hpp
index 2c0321f..e7b3464 100644
--- a/src/player.hpp
+++ b/src/player.hpp
@@ -11,12 +11,16 @@ class Sprite;
 
 class Player : public ce::CollidableNode {
     ce::Vecf const SPEED{3.f, 2.5f};
-    float const ACCELERATION{20.f};
+    float const ACCELERATION{10.f};
+    ce::Vecf const LIMITS{3.f, 3.f};
+    float const DAMAGE_FLASH_FREQ{.1f};
+    float const DAMAGE_FORCE{6.f};
 
     ce::Vecf velocity{0.f, 0.f};
     ce::Vecf input{0.f, 0.f};
     ce::CollisionShape *shape{nullptr};
     ce::Sprite *sprite{nullptr};
+    float invincibility{0.f};
 public:
     Player();
     virtual void _tick(double const &delta) override;
diff --git a/src/truck.cpp b/src/truck.cpp
index f97b82e..c646b46 100644
--- a/src/truck.cpp
+++ b/src/truck.cpp
@@ -1,17 +1,29 @@
 #include "truck.hpp"
-#include "core/callable.hpp"
 #include "core/collision_shape.hpp"
 #include "core/sprite.hpp"
+#include <SDL2/SDL_log.h>
 
-Truck::Truck(float x_pos)
+Truck::Truck(bool left)
 : ce::CollidableNode("truck", 0x1u, 0x1u)
 , sprite{this->create_child<ce::Sprite>("sprite", "truck")}
-, shape{this->create_child<ce::CollisionShape>("truck_col_shape", this, ce::Shape::make_box(2.f, 2.f))} {
-    this->sprite->set_global_transform(this->get_global_transform()
-        .scaled({2.5f, 2.5f})
-        .translated({x_pos, -3.f})
-    );
+, shape{this->create_child<ce::CollisionShape>("truck_col_shape", ce::Shape::make_box(.5f, 1.f))}
+, spawned_left{left} {
+    this->sprite->set_global_transform(this->get_global_transform() .scaled({2.5f, 2.5f}));
+    this->set_global_transform(this->get_global_transform().translated({
+        .x=this->spawned_left ? -1.4f : 1.4f,
+        .y=-4.5f
+    }));
 }
 
 void Truck::_tick(double const &delta) {
+    wave_time += delta * FREQUENCY;
+    ce::Transform const transform{this->get_global_transform()
+        .translated(ce::Vecf{
+            .x=std::sin(wave_time) * AMPLITUDE * (this->spawned_left > 0.f ? 1.f : -1.f),
+            .y=this->RELATIVE_VERTICAL_SPEED
+        } * float(delta))
+    };
+    this->set_global_transform(transform);
+    if(transform.position.y > 4.5f)
+        this->flag_for_deletion();
 }
diff --git a/src/truck.hpp b/src/truck.hpp
index 9a18560..85642d1 100644
--- a/src/truck.hpp
+++ b/src/truck.hpp
@@ -9,10 +9,15 @@ namespace ce {
 };
 
 class Truck : public ce::CollidableNode {
+    float const AMPLITUDE{4.f};
+    float const FREQUENCY{3.f};
+    float const RELATIVE_VERTICAL_SPEED{1.5f};
+    float wave_time{0.f};
+    bool spawned_left{false};
     ce::Sprite *sprite{nullptr};
     ce::CollisionShape *shape{nullptr};
 public:
-    Truck(float x_pos);
+    Truck(bool left);
     virtual void _tick(double const &delta) override;
 };