===================================================================
--- original.js
+++ change.js
@@ -1,56 +1,78 @@
-/****
+/**** 
 * Classes
-****/
+****/ 
+// Bullet class
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -10;
+	self.update = function () {
+		self.y += self.speed;
+		if (self.y < -bulletGraphics.height / 2) {
+			self.destroy();
+		}
+	};
+});
 // 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.direction = 1; // 1 for right, -1 for left
-  self.update = function () {
-    self.x += self.speed * self.direction;
-    if (self.x > 2048 - enemyGraphics.width / 2 || self.x < enemyGraphics.width / 2) {
-      self.direction *= -1;
-    }
-  };
+	var self = Container.call(this);
+	var enemyGraphics = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 5;
+	self.direction = 1; // 1 for right, -1 for left
+	self.update = function () {
+		self.x += self.speed * self.direction;
+		if (self.x > 2048 - enemyGraphics.width / 2 || self.x < enemyGraphics.width / 2) {
+			self.direction *= -1;
+		}
+	};
 });
 //<Assets used in the game will automatically appear here>
 // Spacecraft class for player
 var Spacecraft = Container.expand(function () {
-  var self = Container.call(this);
-  var spacecraftGraphics = self.attachAsset('spacecraft', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 10;
-  self.moveLeft = function () {
-    self.x -= self.speed;
-    if (self.x < spacecraftGraphics.width / 2) {
-      self.x = spacecraftGraphics.width / 2;
-    }
-  };
-  self.moveRight = function () {
-    self.x += self.speed;
-    if (self.x > 2048 - spacecraftGraphics.width / 2) {
-      self.x = 2048 - spacecraftGraphics.width / 2;
-    }
-  };
+	var self = Container.call(this);
+	var spacecraftGraphics = self.attachAsset('spacecraft', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10;
+	self.moveLeft = function () {
+		self.x -= self.speed;
+		if (self.x < spacecraftGraphics.width / 2) {
+			self.x = spacecraftGraphics.width / 2;
+		}
+	};
+	self.moveRight = function () {
+		self.x += self.speed;
+		if (self.x > 2048 - spacecraftGraphics.width / 2) {
+			self.x = 2048 - spacecraftGraphics.width / 2;
+		}
+	};
+	self.shoot = function () {
+		var bullet = new Bullet();
+		bullet.x = self.x;
+		bullet.y = self.y - spacecraftGraphics.height / 2;
+		game.addChild(bullet);
+		bullets.push(bullet);
+	};
 });
 
-/****
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-  backgroundColor: 0x000000 //Init game with black background 
+	backgroundColor: 0x000000 //Init game with black background 
 });
 
-/****
+/**** 
 * Game Code
-****/
+****/ 
 var player = new Spacecraft();
 player.x = 2048 / 2;
 player.y = 2732 - 150;
 game.addChild(player);
@@ -59,14 +81,22 @@
 enemy.y = 100;
 game.addChild(enemy);
 // Handle touch events for player movement
 game.down = function (x, y, obj) {
-  if (x < 2048 / 2) {
-    player.moveLeft();
-  } else {
-    player.moveRight();
-  }
+	if (x < 2048 / 2) {
+		player.moveLeft();
+		player.shoot();
+	} else {
+		player.moveRight();
+	}
 };
 // Update game state
 game.update = function () {
-  enemy.update();
+	enemy.update();
+	for (var i = bullets.length - 1; i >= 0; i--) {
+		bullets[i].update();
+		if (bullets[i].y < -50) {
+			bullets[i].destroy();
+			bullets.splice(i, 1);
+		}
+	}
 };
\ No newline at end of file