diff --git a/App.c b/App.c
index 3c63934..dd1c549 100644
--- a/App.c
+++ b/App.c
@@ -9,7 +9,7 @@
 #include <stdio.h>
 
 
-static void _app_onHit(Entity *me, Entity *other, Vec2 triedDelta, void *data) {
+static void _app_onHitBy(Entity *me, Entity *other, Vec2 triedDelta, void *data) {
 	fprintf(
 		stderr,
 		"[_app_onHit] Entity \"%s\" hit by \"%s\", delta: [%.2lf, %.2lf]\n",
@@ -46,7 +46,7 @@ App *app_NewApp() {
 	hit1->hitbox->box.lefttop = vec2(200, 200);
 	hit1->hitbox->box.size    = vec2(100, 400);
 	hit1->hitbox->fixed       = true;
-	hit1->hitbox->onHit       = &_app_onHit;
+	hit1->hitbox->onHitBy     = &_app_onHitBy;
 	entity_Commit(app->entity, hit1);
 
 	Entity *hit2 = entity_Create(app->entity, "hit2");
@@ -54,9 +54,17 @@ App *app_NewApp() {
 	hit2->hitbox->box.lefttop = vec2(700, 200);
 	hit2->hitbox->box.size    = vec2(100, 400);
 	hit2->hitbox->fixed       = true;
-	hit2->hitbox->onHit       = &_app_onHit;
+	hit2->hitbox->onHitBy     = &_app_onHitBy;
 	entity_Commit(app->entity, hit2);
 
+	Entity *hit3 = entity_Create(app->entity, "hit3");
+	ADD_COMPONENT(hit3, hitbox, zero_malloc(sizeof(Component_Hitbox)));
+	hit3->hitbox->box.lefttop = vec2(100, 550);
+	hit3->hitbox->box.size    = vec2(800, 30);
+	hit3->hitbox->fixed       = true;
+	hit3->hitbox->onHitBy     = &_app_onHitBy;
+	entity_Commit(app->entity, hit3);
+
 	return app;
 }
 
diff --git a/Physics_Component.h b/Physics_Component.h
index 6f7d306..82591a2 100644
--- a/Physics_Component.h
+++ b/Physics_Component.h
@@ -39,7 +39,7 @@ typedef struct {
 	Box2    box;
 	bool    fixed;
 
-	physics_HitHandler onHit;
+	physics_HitHandler onHit, onHitBy;
 	void              *onHitData;
 } Component_Hitbox;
 
diff --git a/Physics_Move.c b/Physics_Move.c
index 7814184..335dfa9 100644
--- a/Physics_Move.c
+++ b/Physics_Move.c
@@ -16,6 +16,10 @@ static inline void call_hithandler(Entity *me, Entity *other, Vec2 triedDelta, v
 	if (me->hitbox->onHit)
 		me->hitbox->onHit(me, other, triedDelta, data);
 }
+static inline void call_hitby(Entity *me, Entity *other, Vec2 triedDelta, void *data) {
+	if (me->hitbox->onHitBy)
+		me->hitbox->onHitBy(me, other, triedDelta, data);
+}
 
 
 void _physics_MoveX(System_Physics *sys, Entity *e, Duration deltaTime) {
@@ -34,14 +38,13 @@ void _physics_MoveX(System_Physics *sys, Entity *e, Duration deltaTime) {
 
 		if (box2_Intersects(tohit, box2_OffsetX(mybox, delta), NULL)) {
 			call_hithandler(e, tohit_comp->super, vec2(delta, 0), e->hitbox->onHitData);
+			call_hitby(tohit_comp->super, e, vec2(delta, 0), tohit_comp->onHitData);
 			if (delta > 0) {
 				// Moves right, hits left edge
-				fprintf(stderr, "hit left edge");
 				double maxdelta = tohit.lefttop.x - mybox.lefttop.x - mybox.size.x;
 				delta           = maxdelta - EPS;
 			} else {
 				// Moves left, hits right edge
-				fprintf(stderr, "hit right edge");
 				double maxdelta = tohit.lefttop.x - mybox.lefttop.x + tohit.size.x;
 				delta           = maxdelta + EPS;
 			}
@@ -72,6 +75,7 @@ void _physics_MoveY(System_Physics *sys, Entity *e, Duration deltaTime) {
 
 		if (box2_Intersects(tohit, box2_OffsetY(mybox, delta), NULL)) {
 			call_hithandler(e, tohit_comp->super, vec2(0, delta), e->hitbox->onHitData);
+			call_hitby(tohit_comp->super, e, vec2(0, delta), tohit_comp->onHitData);
 			if (delta > 0) {
 				// Moves down, hits top edge
 				double maxdelta = tohit.lefttop.y - mybox.lefttop.y - mybox.size.y;
diff --git a/Player_Component.c b/Player_Component.c
index 1bffe3b..8460423 100644
--- a/Player_Component.c
+++ b/Player_Component.c
@@ -62,7 +62,14 @@ void player_Advance(System_Player *sys, Duration deltaTime) {
 	if (input_IsPressed(input->keys[input_Key_Right]))
 		targetVecX += walkSpeed;
 
+	double targetVecY = 0.0;
+	if (input_IsPressed(input->keys[input_Key_Up]))
+		targetVecY += -walkSpeed;
+	if (input_IsPressed(input->keys[input_Key_Down]))
+		targetVecY += walkSpeed;
+
 	sys->player->super->position->velocity.x = targetVecX;
+	sys->player->super->position->velocity.y = targetVecY;
 
 	if (sys->player->onGround)
 		sys->player->jumpCount = 0;
diff --git a/Types.c b/Types.c
index aa5fe93..fe55248 100644
--- a/Types.c
+++ b/Types.c
@@ -32,8 +32,8 @@ bool box2_Intersects(const Box2 x, const Box2 y, Box2 *out_intersection) {
 	// Compute the min and max of the first rectangle on both axes
 	const double r1MinX = dmin(x.lefttop.x, x.lefttop.x + x.size.x);
 	const double r1MaxX = dmax(x.lefttop.x, x.lefttop.x + x.size.x);
-	const double r1MinY = dmin(x.lefttop.y, x.lefttop.x + x.size.x);
-	const double r1MaxY = dmax(x.lefttop.y, x.lefttop.x + x.size.x);
+	const double r1MinY = dmin(x.lefttop.y, x.lefttop.y + x.size.y);
+	const double r1MaxY = dmax(x.lefttop.y, x.lefttop.y + x.size.y);
 
 	// Compute the min and max of the second rectangle on both axes
 	const double r2MinX = dmin(y.lefttop.x, y.lefttop.x + y.size.x);