===================================================================
--- original.js
+++ change.js
@@ -1,120 +1,143 @@
-/****
+/**** 
 * Classes
-****/
-// Asteroid class
-var Asteroid = Container.expand(function () {
-  var self = Container.call(this);
-  var asteroidGraphics = self.attachAsset('asteroid', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 5;
-  self.update = function () {
-    self.y += self.speed;
-    if (self.y > 2732 + asteroidGraphics.height) {
-      self.destroy();
-      asteroids.splice(asteroids.indexOf(self), 1);
-    }
-  };
+****/ 
+// Enemy class
+var Enemy = Container.expand(function () {
+	var self = Container.call(this);
+	var enemyGraphics = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 5;
+	self.update = function () {
+		self.y += self.speed;
+		if (self.y > 2732 + enemyGraphics.height) {
+			self.destroy();
+			enemies.splice(enemies.indexOf(self), 1);
+		}
+	};
 });
-// Hero Bullet class
-var HeroBullet = Container.expand(function () {
-  var self = Container.call(this);
-  var bulletGraphics = self.attachAsset('heroBullet', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = -15;
-  self.update = function () {
-    self.y += self.speed;
-    if (self.y < -bulletGraphics.height) {
-      self.destroy();
-      heroBullets.splice(heroBullets.indexOf(self), 1);
-    }
-  };
-});
 //<Assets used in the game will automatically appear here>
-// Space Shuttle class
-var SpaceShuttle = Container.expand(function () {
-  var self = Container.call(this);
-  var shuttleGraphics = self.attachAsset('shuttle', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 10;
-  self.update = function () {
-    // Update logic for the space shuttle
-  };
-  self.shoot = function () {
-    var bullet = new HeroBullet();
-    bullet.x = self.x;
-    bullet.y = self.y - shuttleGraphics.height / 2;
-    game.addChild(bullet);
-    heroBullets.push(bullet);
-  };
+// Hero class
+var Hero = Container.expand(function () {
+	var self = Container.call(this);
+	var heroGraphics = self.attachAsset('spaceShuttle', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10;
+	self.update = function () {
+		// Update logic for hero
+		if (keyState['ArrowLeft']) {
+			self.x -= self.speed;
+		}
+		if (keyState['ArrowRight']) {
+			self.x += self.speed;
+		}
+	};
+	self.shoot = function () {
+		var bullet = new HeroBullet();
+		bullet.x = self.x;
+		bullet.y = self.y - heroGraphics.height / 2;
+		game.addChild(bullet);
+		heroBullets.push(bullet);
+	};
 });
+// HeroBullet class
+var HeroBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('heroBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -15;
+	self.update = function () {
+		self.y += self.speed;
+		if (self.y < -bulletGraphics.height) {
+			self.destroy();
+			heroBullets.splice(heroBullets.indexOf(self), 1);
+		}
+	};
+});
 
-/****
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-  backgroundColor: 0x000000 //Init game with black background 
+	backgroundColor: 0x000000 //Init game with black background 
 });
 
-/****
+/**** 
 * Game Code
-****/
-// Initialize arrays and variables
+****/ 
+var hero;
 var heroBullets = [];
-var asteroids = [];
+var enemies = [];
 var score = 0;
-var scoreTxt = new Text2('0', {
-  size: 150,
-  fill: "#ffffff"
+var scoreTxt;
+// Initialize hero
+hero = new Hero();
+hero.x = 2048 / 2;
+hero.y = 2732 - 200;
+game.addChild(hero);
+// Initialize score text
+scoreTxt = new Text2('0', {
+	size: 150,
+	fill: "#ffffff"
 });
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
-// Create space shuttle
-var spaceShuttle = new SpaceShuttle();
-spaceShuttle.x = 2048 / 2;
-spaceShuttle.y = 2732 - 200;
-game.addChild(spaceShuttle);
-// Handle touch events for shooting
+// Handle game updates
+game.update = function () {
+	// Update hero bullets
+	for (var i = heroBullets.length - 1; i >= 0; i--) {
+		heroBullets[i].update();
+	}
+	// Update enemies
+	for (var j = enemies.length - 1; j >= 0; j--) {
+		enemies[j].update();
+		if (enemies[j].intersects(hero)) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+		}
+	}
+	// Spawn enemies
+	if (LK.ticks % 60 == 0) {
+		var enemy = new Enemy();
+		enemy.x = Math.random() * 2048;
+		enemy.y = -100;
+		game.addChild(enemy);
+		enemies.push(enemy);
+	}
+	// Check for bullet-enemy collisions
+	for (var k = heroBullets.length - 1; k >= 0; k--) {
+		for (var l = enemies.length - 1; l >= 0; l--) {
+			if (heroBullets[k].intersects(enemies[l])) {
+				heroBullets[k].destroy();
+				enemies[l].destroy();
+				heroBullets.splice(k, 1);
+				enemies.splice(l, 1);
+				score++;
+				scoreTxt.setText(score);
+				break;
+			}
+		}
+	}
+};
+// Handle touch events
+var keyState = {};
+LK.on('keyDown', function (key) {
+	keyState[key] = true;
+});
+LK.on('keyUp', function (key) {
+	keyState[key] = false;
+});
 game.down = function (x, y, obj) {
-  spaceShuttle.shoot();
+	hero.shoot();
 };
-// Update game logic
-game.update = function () {
-  // Update space shuttle
-  spaceShuttle.update();
-  // Update hero bullets
-  for (var i = heroBullets.length - 1; i >= 0; i--) {
-    heroBullets[i].update();
-  }
-  // Update asteroids
-  for (var j = asteroids.length - 1; j >= 0; j--) {
-    asteroids[j].update();
-  }
-  // Check for collisions
-  for (var k = heroBullets.length - 1; k >= 0; k--) {
-    for (var l = asteroids.length - 1; l >= 0; l--) {
-      if (heroBullets[k].intersects(asteroids[l])) {
-        heroBullets[k].destroy();
-        asteroids[l].destroy();
-        heroBullets.splice(k, 1);
-        asteroids.splice(l, 1);
-        score++;
-        scoreTxt.setText(score);
-        break;
-      }
-    }
-  }
-  // Spawn new asteroids
-  if (LK.ticks % 60 == 0) {
-    var asteroid = new Asteroid();
-    asteroid.x = Math.random() * 2048;
-    asteroid.y = -asteroid.height;
-    game.addChild(asteroid);
-    asteroids.push(asteroid);
-  }
+game.move = function (x, y, obj) {
+	hero.x = x;
+};
+game.up = function (x, y, obj) {
+	// No action needed on touch up
 };
\ No newline at end of file