diff --git a/cart.wren b/cart.wren
index 762cd28..0b69007 100644
--- a/cart.wren
+++ b/cart.wren
@@ -25,28 +25,100 @@ class Star {
 	draw() {
 		TIC.circ(_x, _y, _size, _color)
 	}
+
+	isPassed {
+		_x + _size < 0
+	}
+}
+
+class Bullet {
+	construct new(x, y) {
+		_x = x
+		_y = y
+		_speed = 5
+	}
+
+	update() {
+		_x = _x + _speed
+	}
+
+	draw() {
+		TIC.rect(_x, _y, 3, 1, 4)
+	}
+}
+
+class Ship {
+	construct new(x, y) {
+		_x = x
+		_y = y
+		_speed = 1
+		_bullets = []
+	}
+
+	update() {
+		if (TIC.btn(0)) {
+			_y = _y - _speed
+		}
+		if (TIC.btn(1)) {
+			_y = _y + _speed
+		}
+		if (TIC.btn(2)) {
+			_x = _x - _speed
+		}
+		if (TIC.btn(3)) {
+			_x = _x + _speed
+		}
+
+		if (TIC.btnp(4, 5, 10)) {
+			shoot()
+		}
+
+		for (b in _bullets) {
+			b.update()
+		}
+	}
+
+	draw() {
+		TIC.spr(256, _x, _y, 0, 1, 0, 0, 2, 2)
+		for (b in _bullets) {
+			b.draw()
+		}
+	}
+
+	shoot() {
+		_bullets.add(Bullet.new(_x + 8, _y + 8))
+	}
 }
 
 class World {
 	construct new() {
 		_t = 0
 		_stars = []
+		_player = Ship.new(W / 2, H / 2)
+
+		// init background
 		for (i in 0..W) {
 			update()
 		}
 	}
 
 	update() {
+		_player.update()
+
 		for (s in _stars) {
 			s.update()
 		}
+		// collect passed stars
+		while (_stars.count > 0 && _stars[0].isPassed) {
+			_stars.removeAt(0)
+		}
 		// small stars
 		if (_t % 30 == 0) {
 			_stars.add(Star.new(W, R.int(0,H), 1, 1, 12))
 		}
 		// medium stars
 		var width = 10
-		var spaceBetween = width * 5
+		var spaceBetween = width * 10
 		var speed = 0.1
 		var mediumTick = (spaceBetween + width) / speed
 		if (_t % mediumTick == 0) {
@@ -59,6 +131,7 @@ class World {
 		for (s in _stars) {
 			s.draw()
 		}
+		_player.draw()
 	}
 }
 
@@ -82,18 +155,6 @@ class Game is TIC{
 	}
 
 	update() {
-		if(TIC.btn(0)){
-			_y=_y-1
-		}
-		if(TIC.btn(1)){
-			_y=_y+1
-		}
-		if(TIC.btn(2)){
-			_x=_x-1
-		}
-		if(TIC.btn(3)){
-			_x=_x+1
-		}
 		_world.update()
 	}
 
@@ -116,6 +177,13 @@ class Game is TIC{
 // 020:ccca00ccaaaa0ccecaaa0ceeaaaa0ceeaaaa0cee8888ccee000cceeecccceeee
 // </TILES>
 
+// <SPRITES>
+// 000:00000000000000000ccc000000eccccc00eeeeee4ddddddd4cccccdd43ddddcc
+// 001:00000000000000000000000000000000ee990000ddaa9900ddaaaa90ccaaaaa9
+// 016:43dddddd4ddddddd4eeeeeee0ccccccc00000000000000000000000000000000
+// 017:ddccccccddddddd0eeeeee000000000000000000000000000000000000000000
+// </SPRITES>
+
 // <WAVES>
 // 000:00000000ffffffff00000000ffffffff
 // 001:0123456789abcdeffedcba9876543210