===================================================================
--- original.js
+++ change.js
@@ -1,135 +1,143 @@
-/****
+/**** 
 * Classes
-****/
+****/ 
 // 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);
-    }
-  };
+	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);
+		}
+	};
 });
 //<Assets used in the game will automatically appear here>
 // FighterJet class
 var FighterJet = Container.expand(function () {
-  var self = Container.call(this);
-  var jetGraphics = self.attachAsset('fighterJet', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 10;
-  self.update = function () {
-    // Update logic for the fighter jet
-  };
-  self.shoot = function () {
-    var bullet = new HeroBullet();
-    bullet.x = self.x;
-    bullet.y = self.y - jetGraphics.height / 2;
-    game.addChild(bullet);
-    heroBullets.push(bullet);
-  };
+	var self = Container.call(this);
+	var jetGraphics = self.attachAsset('fighterJet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10;
+	self.update = function () {
+		// Update logic for the fighter jet
+	};
+	self.shoot = function () {
+		var bullet = new HeroBullet();
+		bullet.x = self.x;
+		bullet.y = self.y - jetGraphics.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);
-    }
-  };
+	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 variables
 var fighterJet;
 var heroBullets = [];
 var enemies = [];
 var score = 0;
 var scoreTxt;
 // Initialize game elements
 function initGame() {
-  // Create fighter jet
-  fighterJet = new FighterJet();
-  fighterJet.x = 2048 / 2;
-  fighterJet.y = 2732 - 200;
-  game.addChild(fighterJet);
-  // Create score text
-  scoreTxt = new Text2('0', {
-    size: 150,
-    fill: "#ffffff"
-  });
-  scoreTxt.anchor.set(0.5, 0);
-  LK.gui.top.addChild(scoreTxt);
-  // Spawn enemies at intervals
-  LK.setInterval(spawnEnemy, 1000);
+	// Create fighter jet
+	fighterJet = new FighterJet();
+	fighterJet.x = 2048 / 2;
+	fighterJet.y = 2732 - 200;
+	game.addChild(fighterJet);
+	// Create score text
+	scoreTxt = new Text2('0', {
+		size: 150,
+		fill: "#ffffff"
+	});
+	scoreTxt.anchor.set(0.5, 0);
+	LK.gui.top.addChild(scoreTxt);
+	// Spawn enemies at intervals
+	LK.setInterval(spawnEnemy, 1000);
 }
 // Spawn enemy function
 function spawnEnemy() {
-  var enemy = new Enemy();
-  enemy.x = Math.random() * 2048;
-  enemy.y = -enemy.height;
-  game.addChild(enemy);
-  enemies.push(enemy);
+	var enemy = new Enemy();
+	enemy.x = Math.random() * 2048;
+	enemy.y = -enemy.height;
+	game.addChild(enemy);
+	enemies.push(enemy);
 }
 // Update game state
 game.update = function () {
-  // Update fighter jet
-  fighterJet.update();
-  // 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();
-    // Check for collision with hero bullets
-    for (var k = heroBullets.length - 1; k >= 0; k--) {
-      if (enemies[j].intersects(heroBullets[k])) {
-        enemies[j].destroy();
-        heroBullets[k].destroy();
-        enemies.splice(j, 1);
-        heroBullets.splice(k, 1);
-        score++;
-        scoreTxt.setText(score);
-        break;
-      }
-    }
-  }
+	// Update fighter jet
+	fighterJet.update();
+	// 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();
+		// Check for collision with fighter jet
+		if (fighterJet.intersects(enemies[j])) {
+			// Flash screen red for 1 second (1000ms) to show we are dead.
+			LK.effects.flashScreen(0xff0000, 1000);
+			// Show game over. The game will be automatically paused while game over is showing.
+			LK.showGameOver(); // Calling this will destroy the 'Game' and reset entire game state.
+			return;
+		}
+		// Check for collision with hero bullets
+		for (var k = heroBullets.length - 1; k >= 0; k--) {
+			if (enemies[j].intersects(heroBullets[k])) {
+				enemies[j].destroy();
+				heroBullets[k].destroy();
+				enemies.splice(j, 1);
+				heroBullets.splice(k, 1);
+				score++;
+				scoreTxt.setText(score);
+				break;
+			}
+		}
+	}
 };
 // Handle touch events
 game.down = function (x, y, obj) {
-  fighterJet.shoot();
+	fighterJet.shoot();
 };
 game.move = function (x, y, obj) {
-  fighterJet.x = x;
-  fighterJet.y = y;
+	fighterJet.x = x;
+	fighterJet.y = y;
 };
 game.up = function (x, y, obj) {
-  // No action needed on touch up
+	// No action needed on touch up
 };
 // Initialize game
 initGame();
\ No newline at end of file