/**** 
* Classes
****/ 
// Asteroid class
var Asteroid = Container.expand(function () {
	var self = Container.call(this);
	// Attach asteroid asset
	var asteroidGraphics = self.attachAsset('asteroid', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set asteroid speed
	self.speed = -5;
	// Update function called every game tick
	self.update = function () {
		// Move asteroid based on speed
		self.y += self.speed;
	};
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	// Attach bullet asset
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set bullet speed
	self.speed = -5;
	// Update function called every game tick
	self.update = function () {
		// Move bullet based on speed
		self.y += self.speed;
	};
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	// Attach player asset
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set player speed
	self.speed = 5;
	// Update function called every game tick
	self.update = function () {
		// Player movement is handled in game.move event
	};
});

/**** 
* Initialize Game
****/ 
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
game.update = function () {
	// Spawn an asteroid every 60 ticks
	if (LK.ticks % 60 == 0) {
		// Create an asteroid instance
		var asteroid = game.addChild(new Asteroid());
		// Set asteroid initial position to a random x and off the top of the screen
		asteroid.x = Math.random() * 2048;
		asteroid.y = -asteroid.height;
	}
};
var player = game.addChild(new Player());
// Set player initial position
player.x = 1024;
player.y = 2732 - player.height / 2 - 100;
// Add mouse move event to the game
game.move = function (x, y, obj) {
	// Move player to mouse position
	player.x = x;
	player.y = y;
};

===================================================================
--- original.js
+++ change.js
@@ -1,7 +1,23 @@
 /**** 
 * Classes
 ****/ 
+// Asteroid class
+var Asteroid = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach asteroid asset
+	var asteroidGraphics = self.attachAsset('asteroid', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Set asteroid speed
+	self.speed = -5;
+	// Update function called every game tick
+	self.update = function () {
+		// Move asteroid based on speed
+		self.y += self.speed;
+	};
+});
 // Bullet class
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
 	// Attach bullet asset
@@ -44,14 +60,17 @@
 
 /**** 
 * Game Code
 ****/ 
-game.down = function (x, y, obj) {
-	// Create a bullet instance
-	var bullet = game.addChild(new Bullet());
-	// Set bullet initial position
-	bullet.x = player.x;
-	bullet.y = player.y;
+game.update = function () {
+	// Spawn an asteroid every 60 ticks
+	if (LK.ticks % 60 == 0) {
+		// Create an asteroid instance
+		var asteroid = game.addChild(new Asteroid());
+		// Set asteroid initial position to a random x and off the top of the screen
+		asteroid.x = Math.random() * 2048;
+		asteroid.y = -asteroid.height;
+	}
 };
 var player = game.addChild(new Player());
 // Set player initial position
 player.x = 1024;