var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('bullet', 'Bullet Graphics', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.x += self.speed;
	};
	self.explode = function () {};
});
var Element = Container.expand(function () {
	var self = Container.call(this);
	var elementGraphics = self.createAsset('element', 'Element Graphics', .5, .5);
	self.hit = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var bullets = [];
	var elements = [];
	function startNextLevel() {
		bullets.forEach(function (bullet) {
			bullet.destroy();
		});
		bullets = [];
		elements.forEach(function (element) {
			element.destroy();
		});
		elements = [];
		for (var i = 0; i < 10; i++) {
			var element = new Element();
			element.x = Math.random() * 2048;
			element.y = Math.random() * 2732;
			elements.push(element);
			self.addChild(element);
		}
	}
	self.startNextLevel = startNextLevel;
	startNextLevel();
	self.fireBulletsHexagon = function (position) {
		var directions = [{
			x: 1,
			y: 0
		}, {
			x: -1,
			y: 0
		}, {
			x: 0.5,
			y: Math.sqrt(3) / 2
		}, {
			x: -0.5,
			y: Math.sqrt(3) / 2
		}, {
			x: 0.5,
			y: -Math.sqrt(3) / 2
		}, {
			x: -0.5,
			y: -Math.sqrt(3) / 2
		}];
		directions.forEach(function (direction, index) {
			var bullet = new Bullet();
			bullet.x = position.x;
			bullet.y = position.y;
			bullet.rotation = Math.atan2(direction.y, direction.x);
			bullet.move = function () {
				this.x += this.speed * direction.x;
				this.y += this.speed * direction.y;
			};
			bullets.push(bullet);
			self.addChild(bullet);
		});
	};
	stage.on('down', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		self.fireBulletsHexagon(pos);
	});
	LK.on('tick', function () {
		for (var i = 0; i < bullets.length; i++) {
			bullets[i].move();
		}
		for (var i = 0; i < bullets.length; i++) {
			for (var j = 0; j < elements.length; j++) {
				if (bullets[i].intersects(elements[j])) {
					bullets[i].explode();
					elements[j].hit();
				}
			}
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,13 +1,10 @@
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = self.createAsset('bullet', 'Bullet Graphics', .5, .5);
 	self.speed = 5;
-	self.move = function (direction) {
-		if (!direction) return;
-		this.x += this.speed * direction.x;
-		this.y += this.speed * direction.y;
-		this.rotation = Math.atan2(direction.y, direction.x);
+	self.move = function () {
+		self.x += self.speed;
 	};
 	self.explode = function () {};
 });
 var Element = Container.expand(function () {
@@ -57,13 +54,17 @@
 		}, {
 			x: -0.5,
 			y: -Math.sqrt(3) / 2
 		}];
-		directions.forEach(function (direction) {
+		directions.forEach(function (direction, index) {
 			var bullet = new Bullet();
 			bullet.x = position.x;
 			bullet.y = position.y;
-			bullet.move(direction);
+			bullet.rotation = Math.atan2(direction.y, direction.x);
+			bullet.move = function () {
+				this.x += this.speed * direction.x;
+				this.y += this.speed * direction.y;
+			};
 			bullets.push(bullet);
 			self.addChild(bullet);
 		});
 	};