===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,325 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Enemy Class
+var Enemy = Container.expand(function () {
+	var self = Container.call(this);
+	var enemy = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = enemy.width;
+	self.height = enemy.height;
+	self.speed = 6 + Math.random() * 4; // Downwards, randomize a bit
+	self.type = 0; // 0: normal, 1: zigzag, 2: shooter
+	self.dir = Math.random() < 0.5 ? -1 : 1; // for zigzag
+	self.shootCooldown = 0;
+	self.update = function () {
+		if (self.type === 1) {
+			// Zigzag
+			self.x += self.dir * 12 * Math.sin(LK.ticks / 20 + self._zigzagSeed);
+		}
+		self.y += self.speed;
+		// Shooter
+		if (self.type === 2) {
+			self.shootCooldown--;
+			if (self.shootCooldown <= 0) {
+				self.shootCooldown = 90 + Math.floor(Math.random() * 60);
+				spawnEnemyBullet(self.x, self.y + self.height / 2);
+			}
+		}
+	};
+	// For zigzag
+	self._zigzagSeed = Math.random() * 1000;
+	// Flash on hit
+	self.flash = function () {
+		tween(enemy, {
+			tint: 0xffffff
+		}, {
+			duration: 80,
+			onFinish: function onFinish() {
+				tween(enemy, {
+					tint: 0xff3333
+				}, {
+					duration: 120
+				});
+			}
+		});
+	};
+	enemy.tint = 0xff3333;
+	return self;
+});
+// Enemy Bullet Class
+var EnemyBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('enemyBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 18; // Downwards
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Hero Bullet Class
+var HeroBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('heroBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -32; // Upwards
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Hero Ship Class
+var HeroShip = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach ship asset (box, blue)
+	var ship = self.attachAsset('heroShip', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Ship properties
+	self.width = ship.width;
+	self.height = ship.height;
+	self.cooldown = 0; // fire cooldown
+	// Ship hit flash
+	self.flash = function () {
+		tween(ship, {
+			tint: 0xff0000
+		}, {
+			duration: 100,
+			onFinish: function onFinish() {
+				tween(ship, {
+					tint: 0x3399ff
+				}, {
+					duration: 200
+				});
+			}
+		});
+	};
+	// Ship reset color
+	ship.tint = 0x3399ff;
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x000010
+});
+
+/**** 
+* Game Code
+****/ 
+// Score text
+// Asset definitions (shapes)
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Game variables
+var hero = null;
+var heroBullets = [];
+var enemies = [];
+var enemyBullets = [];
+var dragNode = null;
+var lastHeroX = 0;
+var lastHeroY = 0;
+var spawnTimer = 0;
+var wave = 1;
+var nextWaveScore = 10;
+var gameOver = false;
+// Helper: spawn hero bullet
+function spawnHeroBullet(x, y) {
+	var b = new HeroBullet();
+	b.x = x;
+	b.y = y - hero.height / 2;
+	heroBullets.push(b);
+	game.addChild(b);
+}
+// Helper: spawn enemy bullet
+function spawnEnemyBullet(x, y) {
+	var b = new EnemyBullet();
+	b.x = x;
+	b.y = y;
+	enemyBullets.push(b);
+	game.addChild(b);
+}
+// Helper: spawn enemy
+function spawnEnemy(type, x, y) {
+	var e = new Enemy();
+	e.x = x;
+	e.y = y;
+	e.type = type;
+	if (type === 2) {
+		e.shootCooldown = 60 + Math.floor(Math.random() * 60);
+	}
+	enemies.push(e);
+	game.addChild(e);
+}
+// Helper: spawn wave
+function spawnWave(waveNum) {
+	var count = 3 + waveNum;
+	var spacing = 2048 / (count + 1);
+	for (var i = 0; i < count; i++) {
+		var type = 0;
+		if (waveNum >= 2 && i % 3 === 0) type = 1; // zigzag
+		if (waveNum >= 3 && i % 4 === 0) type = 2; // shooter
+		spawnEnemy(type, spacing * (i + 1), -150 - Math.random() * 200);
+	}
+}
+// Reset game state
+function resetGame() {
+	// Remove all
+	for (var i = 0; i < heroBullets.length; i++) heroBullets[i].destroy();
+	for (var i = 0; i < enemies.length; i++) enemies[i].destroy();
+	for (var i = 0; i < enemyBullets.length; i++) enemyBullets[i].destroy();
+	heroBullets = [];
+	enemies = [];
+	enemyBullets = [];
+	wave = 1;
+	nextWaveScore = 10;
+	LK.setScore(0);
+	scoreTxt.setText('0');
+	gameOver = false;
+	// Hero
+	if (hero) hero.destroy();
+	hero = new HeroShip();
+	hero.x = 2048 / 2;
+	hero.y = 2732 - 220;
+	game.addChild(hero);
+	// First wave
+	spawnWave(wave);
+}
+// Drag/move handler
+function handleMove(x, y, obj) {
+	if (dragNode && !gameOver) {
+		// Clamp inside screen
+		var minX = hero.width / 2;
+		var maxX = 2048 - hero.width / 2;
+		dragNode.x = Math.max(minX, Math.min(maxX, x));
+		// Y is fixed (bottom)
+		dragNode.y = hero.y;
+	}
+}
+// Touch/drag events
+game.down = function (x, y, obj) {
+	if (gameOver) return;
+	// Only allow drag if touch is on hero
+	var local = hero.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
+	if (local.x > -hero.width / 2 && local.x < hero.width / 2 && local.y > -hero.height / 2 && local.y < hero.height / 2) {
+		dragNode = hero;
+		handleMove(x, y, obj);
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+game.move = handleMove;
+// Main update loop
+game.update = function () {
+	if (gameOver) return;
+	// Hero fire
+	if (hero.cooldown > 0) hero.cooldown--;
+	if (hero.cooldown <= 0) {
+		spawnHeroBullet(hero.x, hero.y - hero.height / 2);
+		hero.cooldown = 18;
+	}
+	// Update hero bullets
+	for (var i = heroBullets.length - 1; i >= 0; i--) {
+		var b = heroBullets[i];
+		b.update();
+		// Off screen
+		if (b.y < -80) {
+			b.destroy();
+			heroBullets.splice(i, 1);
+			continue;
+		}
+		// Hit enemy
+		var hit = false;
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var e = enemies[j];
+			if (b.intersects(e)) {
+				e.flash();
+				b.destroy();
+				heroBullets.splice(i, 1);
+				enemies.splice(j, 1);
+				e.destroy();
+				LK.setScore(LK.getScore() + 1);
+				scoreTxt.setText(LK.getScore());
+				hit = true;
+				break;
+			}
+		}
+		if (hit) continue;
+	}
+	// Update enemies
+	for (var i = enemies.length - 1; i >= 0; i--) {
+		var e = enemies[i];
+		e.update();
+		// Off screen
+		if (e.y > 2732 + 100) {
+			e.destroy();
+			enemies.splice(i, 1);
+			continue;
+		}
+		// Collide with hero
+		if (e.intersects(hero)) {
+			hero.flash();
+			LK.effects.flashScreen(0xff0000, 1000);
+			gameOver = true;
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Update enemy bullets
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		var b = enemyBullets[i];
+		b.update();
+		// Off screen
+		if (b.y > 2732 + 80) {
+			b.destroy();
+			enemyBullets.splice(i, 1);
+			continue;
+		}
+		// Hit hero
+		if (b.intersects(hero)) {
+			hero.flash();
+			b.destroy();
+			enemyBullets.splice(i, 1);
+			LK.effects.flashScreen(0xff0000, 1000);
+			gameOver = true;
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Spawn new wave if all enemies gone
+	if (enemies.length === 0) {
+		wave++;
+		spawnWave(wave);
+	}
+	// Next wave at score milestones
+	if (LK.getScore() >= nextWaveScore) {
+		wave++;
+		nextWaveScore += 10 + wave * 2;
+		spawnWave(wave);
+	}
+};
+// Start game
+resetGame();
\ No newline at end of file