===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,351 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Bullet class
+var Bullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletSprite = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -32;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Enemy class
+var Enemy = Container.expand(function () {
+	var self = Container.call(this);
+	var enemySprite = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = enemySprite.width * 0.5;
+	self.speed = 8 + Math.random() * 8;
+	self.dir = Math.random() < 0.5 ? -1 : 1;
+	self.xSpeed = self.dir * (4 + Math.random() * 6);
+	self.update = function () {
+		self.y += self.speed;
+		self.x += self.xSpeed;
+		// Bounce off walls
+		if (self.x < self.radius) {
+			self.x = self.radius;
+			self.xSpeed *= -1;
+		}
+		if (self.x > 2048 - self.radius) {
+			self.x = 2048 - self.radius;
+			self.xSpeed *= -1;
+		}
+	};
+	return self;
+});
+// Obstacle class
+var Obstacle = Container.expand(function () {
+	var self = Container.call(this);
+	var obsSprite = self.attachAsset('obstacle', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = obsSprite.width;
+	self.height = obsSprite.height;
+	self.speed = 12 + Math.random() * 8;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Player class
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var playerSprite = self.attachAsset('player', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = playerSprite.width * 0.5;
+	self.lives = 3;
+	self.invincible = false;
+	self.invincibleTicks = 0;
+	self.shootCooldown = 0;
+	self.update = function () {
+		if (self.invincible) {
+			self.invincibleTicks--;
+			if (self.invincibleTicks <= 0) {
+				self.invincible = false;
+				playerSprite.alpha = 1;
+			} else {
+				// Flicker effect
+				playerSprite.alpha = LK.ticks % 10 < 5 ? 0.4 : 1;
+			}
+		}
+		if (self.shootCooldown > 0) self.shootCooldown--;
+	};
+	// Called when player is hit
+	self.hit = function () {
+		if (self.invincible) return;
+		self.lives--;
+		self.invincible = true;
+		self.invincibleTicks = 90; // 1.5 seconds
+		playerSprite.alpha = 0.4;
+		LK.effects.flashObject(self, 0xff0000, 500);
+		LK.getSound('hit').play();
+	};
+	// Called when player picks up a powerup
+	self.powerup = function () {
+		self.invincible = true;
+		self.invincibleTicks = 180; // 3 seconds
+		playerSprite.alpha = 0.4;
+		LK.getSound('powerup').play();
+	};
+	return self;
+});
+// Powerup class
+var Powerup = Container.expand(function () {
+	var self = Container.call(this);
+	var puSprite = self.attachAsset('powerup', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = puSprite.width * 0.5;
+	self.speed = 10;
+	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: 0x181818
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sound effects
+// Powerup: green ellipse
+// Bullet: yellow box
+// Obstacle: orange box
+// Enemy: red ellipse
+// Player character: blue box
+// Game state variables
+var player;
+var bullets = [];
+var enemies = [];
+var obstacles = [];
+var powerups = [];
+var dragNode = null;
+var lastTouch = {
+	x: 0,
+	y: 0
+};
+var scoreTxt, livesTxt;
+var spawnTick = 0;
+var difficulty = 1;
+var gameOver = false;
+// UI
+scoreTxt = new Text2('0', {
+	size: 120,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+livesTxt = new Text2('♥♥♥', {
+	size: 90,
+	fill: 0xFF5252
+});
+livesTxt.anchor.set(1, 0);
+LK.gui.topRight.addChild(livesTxt);
+// Start music
+LK.playMusic('arcadebg');
+// Create player
+player = new Player();
+player.x = 2048 / 2;
+player.y = 2732 - 350;
+game.addChild(player);
+// Helper: update lives display
+function updateLives() {
+	var s = '';
+	for (var i = 0; i < player.lives; i++) s += '♥';
+	livesTxt.setText(s);
+}
+// Helper: spawn enemy
+function spawnEnemy() {
+	var e = new Enemy();
+	e.x = 200 + Math.random() * (2048 - 400);
+	e.y = -100;
+	enemies.push(e);
+	game.addChild(e);
+}
+// Helper: spawn obstacle
+function spawnObstacle() {
+	var o = new Obstacle();
+	o.x = 200 + Math.random() * (2048 - 400);
+	o.y = -60;
+	obstacles.push(o);
+	game.addChild(o);
+}
+// Helper: spawn powerup
+function spawnPowerup() {
+	var p = new Powerup();
+	p.x = 200 + Math.random() * (2048 - 400);
+	p.y = -80;
+	powerups.push(p);
+	game.addChild(p);
+}
+// Touch controls: drag player
+game.down = function (x, y, obj) {
+	// Don't allow drag from top left 100x100
+	if (x < 100 && y < 100) return;
+	if (player && !gameOver) {
+		dragNode = player;
+		lastTouch.x = x;
+		lastTouch.y = y;
+	}
+};
+game.move = function (x, y, obj) {
+	if (dragNode && !gameOver) {
+		// Clamp to game area
+		var px = Math.max(player.radius, Math.min(2048 - player.radius, x));
+		var py = Math.max(player.radius, Math.min(2732 - player.radius, y));
+		player.x = px;
+		player.y = py;
+		lastTouch.x = x;
+		lastTouch.y = y;
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+// Tap to shoot (anywhere except top left 100x100)
+game.on('down', function (x, y, obj) {
+	if (x < 100 && y < 100) return;
+	if (player && !gameOver && player.shootCooldown <= 0) {
+		var b = new Bullet();
+		b.x = player.x;
+		b.y = player.y - player.radius - 20;
+		bullets.push(b);
+		game.addChild(b);
+		player.shootCooldown = 12; // 0.2s
+		LK.getSound('shoot').play();
+	}
+});
+// Main game loop
+game.update = function () {
+	if (gameOver) return;
+	// Increase difficulty over time
+	if (LK.ticks % 600 === 0 && difficulty < 10) {
+		difficulty++;
+	}
+	// Player update
+	player.update();
+	// Spawn logic
+	spawnTick++;
+	if (spawnTick % Math.max(60 - difficulty * 4, 20) === 0) {
+		if (Math.random() < 0.6) spawnEnemy();else spawnObstacle();
+	}
+	if (spawnTick % 300 === 0 && Math.random() < 0.5) {
+		spawnPowerup();
+	}
+	// Bullets
+	for (var i = bullets.length - 1; i >= 0; i--) {
+		var b = bullets[i];
+		b.update();
+		if (b.y < -60) {
+			b.destroy();
+			bullets.splice(i, 1);
+			continue;
+		}
+		// Bullet hits enemy
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var e = enemies[j];
+			if (b.intersects(e)) {
+				LK.setScore(LK.getScore() + 10);
+				scoreTxt.setText(LK.getScore());
+				LK.getSound('enemyDown').play();
+				e.destroy();
+				enemies.splice(j, 1);
+				b.destroy();
+				bullets.splice(i, 1);
+				break;
+			}
+		}
+	}
+	// Enemies
+	for (var i = enemies.length - 1; i >= 0; i--) {
+		var e = enemies[i];
+		e.update();
+		if (e.y > 2732 + 100) {
+			e.destroy();
+			enemies.splice(i, 1);
+			continue;
+		}
+		// Enemy hits player
+		if (e.intersects(player)) {
+			if (!player.invincible) {
+				player.hit();
+				updateLives();
+				if (player.lives <= 0) {
+					gameOver = true;
+					LK.effects.flashScreen(0xff0000, 1000);
+					LK.showGameOver();
+					return;
+				}
+			}
+			e.destroy();
+			enemies.splice(i, 1);
+		}
+	}
+	// Obstacles
+	for (var i = obstacles.length - 1; i >= 0; i--) {
+		var o = obstacles[i];
+		o.update();
+		if (o.y > 2732 + 60) {
+			o.destroy();
+			obstacles.splice(i, 1);
+			continue;
+		}
+		// Obstacle hits player
+		if (o.intersects(player)) {
+			if (!player.invincible) {
+				player.hit();
+				updateLives();
+				if (player.lives <= 0) {
+					gameOver = true;
+					LK.effects.flashScreen(0xff0000, 1000);
+					LK.showGameOver();
+					return;
+				}
+			}
+			o.destroy();
+			obstacles.splice(i, 1);
+		}
+	}
+	// Powerups
+	for (var i = powerups.length - 1; i >= 0; i--) {
+		var p = powerups[i];
+		p.update();
+		if (p.y > 2732 + 80) {
+			p.destroy();
+			powerups.splice(i, 1);
+			continue;
+		}
+		// Powerup hits player
+		if (p.intersects(player)) {
+			player.powerup();
+			p.destroy();
+			powerups.splice(i, 1);
+		}
+	}
+};
+// Score display
+scoreTxt.setText(LK.getScore());
+updateLives();
\ No newline at end of file