===================================================================
--- original.js
+++ change.js
@@ -1,34 +1,46 @@
 /**** 
 * Classes
 ****/ 
-var Bike = Container.expand(function () {
+// Create a Player class for the bike
+var Player = Container.expand(function () {
 	var self = Container.call(this);
+	// Attach the bike asset to the player
 	var bikeGraphics = self.attachAsset('bike', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
+	// Set the initial speed of the bike
 	self.speed = 5;
+	// This is automatically called every game tick, if the player is attached!
 	self.update = function () {
-		self.x += self.speed;
+		self.y += self.speed;
 	};
 });
 
 /**** 
 * Initialize Game
 ****/ 
+// Add the player to the game
 var game = new LK.Game({
 	backgroundColor: 0x000000 //Init game with black background
 });
 
 /**** 
 * Game Code
 ****/ 
-var bike = game.addChild(new Bike());
-bike.x = 2048 / 2;
-bike.y = 2732 / 2;
-game.update = function () {
-	bike.y += bike.speed;
-	if (bike.y > 2732) {
-		bike.y = 0;
-	}
-};
\ No newline at end of file
+// Add the player to the game
+var player = game.addChild(new Player());
+// Position the player at the bottom center of the screen
+player.x = 2048 / 2;
+player.y = 2732 - player.height / 2;
+// Move the player left or right based on touch events
+game.move = function (x, y, obj) {
+	player.x = x;
+};
+// Check if the player hits the screen edges
+if (player.x < 0 || player.x > 2048) {
+	// Show game over. The game will be automatically paused while game over is showing.
+	LK.showGameOver();
+}
+// Play a sound effect when the game is over
+LK.getSound('enemyDestroyed').play();
\ No newline at end of file