===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,163 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Enemy = Container.expand(function () {
+	var self = Container.call(this);
+	var enemyGraphics = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 3;
+	self.direction = Math.random() < 0.5 ? -1 : 1;
+	self.horizontalSpeed = Math.random() * 2 + 1;
+	self.update = function () {
+		self.y += self.speed;
+		self.x += self.direction * self.horizontalSpeed;
+		// Bounce off screen edges
+		if (self.x < 30 || self.x > 2018) {
+			self.direction *= -1;
+		}
+	};
+	return self;
+});
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var shipGraphics = self.attachAsset('playerShip', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	return self;
+});
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('playerBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -12;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x000033
+});
+
+/**** 
+* Game Code
+****/ 
+var player = game.addChild(new Player());
+player.x = 1024;
+player.y = 2600;
+var bullets = [];
+var enemies = [];
+var gameSpeed = 1;
+var enemySpawnRate = 120;
+var lastEnemySpawn = 0;
+var scoreTxt = new Text2('0', {
+	size: 80,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+scoreTxt.y = 50;
+// Auto-fire bullets
+var bulletTimer = LK.setInterval(function () {
+	var newBullet = new PlayerBullet();
+	newBullet.x = player.x;
+	newBullet.y = player.y - 40;
+	newBullet.lastY = newBullet.y;
+	bullets.push(newBullet);
+	game.addChild(newBullet);
+	LK.getSound('shoot').play();
+}, 150);
+function handleMove(x, y, obj) {
+	player.x = x;
+	// Keep player within screen bounds
+	if (player.x < 40) player.x = 40;
+	if (player.x > 2008) player.x = 2008;
+}
+game.move = handleMove;
+game.down = function (x, y, obj) {
+	handleMove(x, y, obj);
+};
+game.update = function () {
+	// Spawn enemies
+	if (LK.ticks - lastEnemySpawn > enemySpawnRate) {
+		var newEnemy = new Enemy();
+		newEnemy.x = Math.random() * (2048 - 120) + 60;
+		newEnemy.y = -30;
+		newEnemy.lastY = newEnemy.y;
+		newEnemy.lastIntersecting = false;
+		enemies.push(newEnemy);
+		game.addChild(newEnemy);
+		lastEnemySpawn = LK.ticks;
+		// Increase difficulty over time
+		if (enemySpawnRate > 40) {
+			enemySpawnRate -= 0.5;
+		}
+	}
+	// Update bullets
+	for (var i = bullets.length - 1; i >= 0; i--) {
+		var bullet = bullets[i];
+		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
+		// Remove bullets that go off screen
+		if (bullet.lastY >= -10 && bullet.y < -10) {
+			bullet.destroy();
+			bullets.splice(i, 1);
+			continue;
+		}
+		// Check bullet-enemy collisions
+		var bulletHit = false;
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var enemy = enemies[j];
+			if (bullet.intersects(enemy)) {
+				// Destroy both bullet and enemy
+				LK.setScore(LK.getScore() + 10);
+				scoreTxt.setText(LK.getScore());
+				bullet.destroy();
+				bullets.splice(i, 1);
+				enemy.destroy();
+				enemies.splice(j, 1);
+				LK.getSound('enemyDestroy').play();
+				bulletHit = true;
+				break;
+			}
+		}
+		if (!bulletHit) {
+			bullet.lastY = bullet.y;
+		}
+	}
+	// Update enemies
+	for (var k = enemies.length - 1; k >= 0; k--) {
+		var enemy = enemies[k];
+		if (enemy.lastY === undefined) enemy.lastY = enemy.y;
+		if (enemy.lastIntersecting === undefined) enemy.lastIntersecting = false;
+		// Remove enemies that go off screen
+		if (enemy.lastY <= 2732 && enemy.y > 2732) {
+			enemy.destroy();
+			enemies.splice(k, 1);
+			continue;
+		}
+		// Check player-enemy collision
+		var currentIntersecting = enemy.intersects(player);
+		if (!enemy.lastIntersecting && currentIntersecting) {
+			LK.getSound('playerHit').play();
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+			return;
+		}
+		enemy.lastY = enemy.y;
+		enemy.lastIntersecting = currentIntersecting;
+	}
+};
\ No newline at end of file