===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,304 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Hero class
+var Hero = Container.expand(function () {
+	var self = Container.call(this);
+	var heroSprite = self.attachAsset('hero', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = heroSprite.width * 0.5;
+	self.shootCooldown = 0; // ticks until next shot allowed
+	// Called every tick
+	self.update = function () {
+		if (self.shootCooldown > 0) self.shootCooldown--;
+	};
+	// Shoot a bullet upwards
+	self.shoot = function () {
+		if (self.shootCooldown === 0) {
+			var bullet = new HeroBullet();
+			bullet.x = self.x;
+			bullet.y = self.y - self.radius - bullet.height * 0.5;
+			heroBullets.push(bullet);
+			game.addChild(bullet);
+			LK.getSound('heroShoot').play();
+			self.shootCooldown = 12; // 12 ticks cooldown (~0.2s)
+		}
+	};
+	return self;
+});
+// Hero bullet class
+var HeroBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletSprite = self.attachAsset('heroBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = bulletSprite.width;
+	self.height = bulletSprite.height;
+	self.speed = -22;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Mutant enemy class
+var Mutant = Container.expand(function () {
+	var self = Container.call(this);
+	var mutantSprite = self.attachAsset('mutant', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = mutantSprite.width * 0.5;
+	self.speed = 3 + Math.random() * 2; // Vary speed a bit
+	self.shootTimer = 60 + Math.floor(Math.random() * 60); // Randomize first shot
+	self.hp = 2; // Mutants take 2 hits
+	// Called every tick
+	self.update = function () {
+		self.y += self.speed;
+		self.shootTimer--;
+		if (self.shootTimer <= 0) {
+			self.shoot();
+			self.shootTimer = 90 + Math.floor(Math.random() * 60); // Next shot
+		}
+	};
+	// Shoot a bullet downwards
+	self.shoot = function () {
+		var bullet = new MutantBullet();
+		bullet.x = self.x;
+		bullet.y = self.y + self.radius + bullet.height * 0.5;
+		mutantBullets.push(bullet);
+		game.addChild(bullet);
+		LK.getSound('mutantShoot').play();
+	};
+	// Take damage
+	self.hit = function () {
+		self.hp--;
+		LK.getSound('mutantHit').play();
+		LK.effects.flashObject(self, 0xffffff, 150);
+		if (self.hp <= 0) {
+			self.destroy();
+			return true;
+		}
+		return false;
+	};
+	return self;
+});
+// Mutant bullet class
+var MutantBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletSprite = self.attachAsset('mutantBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = bulletSprite.width;
+	self.height = bulletSprite.height;
+	self.speed = 14;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x181818
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sound effects
+// Mutant bullet: red ellipse
+// Hero bullet: yellow box
+// Mutant: green ellipse
+// Hero: blue box
+// Game variables
+var hero;
+var mutants = [];
+var heroBullets = [];
+var mutantBullets = [];
+var dragNode = null;
+var lastHeroX = 0,
+	lastHeroY = 0;
+var score = 0;
+var scoreTxt;
+var wave = 1;
+var spawnTimer = 0;
+var gameOver = false;
+// Score display
+scoreTxt = new Text2('0', {
+	size: 120,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Start music
+LK.playMusic('bgmusic');
+// Create hero
+hero = new Hero();
+hero.x = 2048 / 2;
+hero.y = 2732 - 350;
+game.addChild(hero);
+// Helper: spawn a wave of mutants
+function spawnMutantWave() {
+	var count = Math.min(2 + wave, 8);
+	for (var i = 0; i < count; i++) {
+		var m = new Mutant();
+		// Spread mutants horizontally, randomize a bit
+		var spacing = 2048 / (count + 1);
+		m.x = spacing * (i + 1) + (Math.random() - 0.5) * 80;
+		m.y = -100 - Math.random() * 200;
+		mutants.push(m);
+		game.addChild(m);
+	}
+	wave++;
+}
+// Initial wave
+spawnMutantWave();
+// Touch/mouse drag controls
+function handleMove(x, y, obj) {
+	if (dragNode) {
+		// Clamp hero inside game area, avoid top 100px and bottom 100px
+		var minX = hero.radius + 20;
+		var maxX = 2048 - hero.radius - 20;
+		var minY = 120 + hero.radius;
+		var maxY = 2732 - hero.radius - 40;
+		dragNode.x = Math.max(minX, Math.min(maxX, x));
+		dragNode.y = Math.max(minY, Math.min(maxY, y));
+	}
+}
+game.move = handleMove;
+game.down = function (x, y, obj) {
+	// Only start drag if touch is on hero
+	var dx = x - hero.x,
+		dy = y - hero.y;
+	if (dx * dx + dy * dy <= hero.radius * hero.radius * 1.2) {
+		dragNode = hero;
+		handleMove(x, y, obj);
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+// Main game loop
+game.update = function () {
+	if (gameOver) return;
+	// Hero update
+	hero.update();
+	// Hero auto-shoots every 10 ticks
+	if (LK.ticks % 10 === 0) {
+		hero.shoot();
+	}
+	// Mutant update
+	for (var i = mutants.length - 1; i >= 0; i--) {
+		var m = mutants[i];
+		m.update();
+		// Remove if off screen
+		if (m.y > 2732 + 100) {
+			m.destroy();
+			mutants.splice(i, 1);
+			continue;
+		}
+		// Mutant collides with hero (game over)
+		if (m.intersects(hero)) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.getSound('heroHit').play();
+			gameOver = true;
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Hero bullets update
+	for (var i = heroBullets.length - 1; i >= 0; i--) {
+		var b = heroBullets[i];
+		b.update();
+		// Remove if off screen
+		if (b.y < -100) {
+			b.destroy();
+			heroBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with mutants
+		var hit = false;
+		for (var j = mutants.length - 1; j >= 0; j--) {
+			var m = mutants[j];
+			if (b.intersects(m)) {
+				b.destroy();
+				heroBullets.splice(i, 1);
+				if (m.hit()) {
+					// Mutant destroyed
+					m.destroy();
+					mutants.splice(j, 1);
+					score += 10;
+					scoreTxt.setText(score);
+				} else {
+					score += 2;
+					scoreTxt.setText(score);
+				}
+				hit = true;
+				break;
+			}
+		}
+		if (hit) continue;
+	}
+	// Mutant bullets update
+	for (var i = mutantBullets.length - 1; i >= 0; i--) {
+		var b = mutantBullets[i];
+		b.update();
+		// Remove if off screen
+		if (b.y > 2732 + 100) {
+			b.destroy();
+			mutantBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with hero
+		if (b.intersects(hero)) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.getSound('heroHit').play();
+			b.destroy();
+			mutantBullets.splice(i, 1);
+			gameOver = true;
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Spawn new wave if all mutants gone
+	if (mutants.length === 0 && spawnTimer === 0) {
+		spawnTimer = 40; // Wait 40 ticks before next wave
+	}
+	if (spawnTimer > 0) {
+		spawnTimer--;
+		if (spawnTimer === 0) {
+			spawnMutantWave();
+		}
+	}
+};
+// Reset game state on restart
+game.on('reset', function () {
+	// Remove all objects
+	for (var i = 0; i < mutants.length; i++) mutants[i].destroy();
+	for (var i = 0; i < heroBullets.length; i++) heroBullets[i].destroy();
+	for (var i = 0; i < mutantBullets.length; i++) mutantBullets[i].destroy();
+	mutants = [];
+	heroBullets = [];
+	mutantBullets = [];
+	score = 0;
+	scoreTxt.setText(score);
+	wave = 1;
+	spawnTimer = 0;
+	gameOver = false;
+	hero.x = 2048 / 2;
+	hero.y = 2732 - 350;
+	spawnMutantWave();
+	LK.playMusic('bgmusic');
 });
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