===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,442 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Alien class
+var Alien = Container.expand(function () {
+	var self = Container.call(this);
+	var alienSprite = self.attachAsset('alien', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = alienSprite.width;
+	self.height = alienSprite.height;
+	self.speed = 2.5;
+	self.hp = 1;
+	self.wave = 1;
+	self.lastX = self.x;
+	self.lastY = self.y;
+	self.lastIntersecting = false;
+	self.isDead = false;
+	self.update = function () {
+		self.x -= self.speed;
+	};
+	return self;
+});
+// Bonus box class
+var BonusBox = Container.expand(function () {
+	var self = Container.call(this);
+	var bonusSprite = self.attachAsset('bonus', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = bonusSprite.width;
+	self.height = bonusSprite.height;
+	self.lastY = self.y;
+	self.lastIntersecting = false;
+	self.type = null; // Set on spawn
+	return self;
+});
+// Crystal class
+var Crystal = Container.expand(function () {
+	var self = Container.call(this);
+	var crystalSprite = self.attachAsset('crystal', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = crystalSprite.width;
+	self.height = crystalSprite.height;
+	self.lastY = self.y;
+	self.lastIntersecting = false;
+	return self;
+});
+// Laser class
+var Laser = Container.expand(function () {
+	var self = Container.call(this);
+	var laserSprite = self.attachAsset('laser', {
+		anchorX: 0.5,
+		anchorY: 1
+	});
+	self.width = laserSprite.width;
+	self.height = laserSprite.height;
+	self.speed = 32;
+	self.pierce = false;
+	self.lastY = self.y;
+	self.lastIntersecting = false;
+	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.width = playerSprite.width;
+	self.height = playerSprite.height;
+	self.shootCooldown = 0;
+	self.moveSpeed = 32; // px per tick when dragged
+	self.leftLimit = 0 + self.width / 2 + 40;
+	self.rightLimit = 2048 - self.width / 2 - 40;
+	self.powered = false;
+	self.powerTimer = 0;
+	self.powerType = null;
+	// For powerup visuals
+	self.setPower = function (type, duration) {
+		self.powered = true;
+		self.powerType = type;
+		self.powerTimer = duration;
+		if (type === 'rapid') {
+			playerSprite.tint = 0xffe100;
+		} else if (type === 'pierce') {
+			playerSprite.tint = 0x00ffb0;
+		} else if (type === 'shield') {
+			playerSprite.tint = 0x00eaff;
+		}
+	};
+	self.clearPower = function () {
+		self.powered = false;
+		self.powerType = null;
+		self.powerTimer = 0;
+		playerSprite.tint = 0xffffff;
+	};
+	self.update = function () {
+		if (self.powered) {
+			self.powerTimer--;
+			if (self.powerTimer <= 0) {
+				self.clearPower();
+			}
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x0a0a1a
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sound effects
+// Bonus box
+// Crystal (collectible)
+// Player bullet (laser)
+// Alien (enemy)
+// Player
+// Game constants
+var GAME_WIDTH = 2048;
+var GAME_HEIGHT = 2732;
+var GROUND_Y = GAME_HEIGHT - 220;
+var PLAYER_START_X = GAME_WIDTH / 2;
+var PLAYER_START_Y = GROUND_Y;
+var PLAYER_MIN_X = 160 + 40;
+var PLAYER_MAX_X = GAME_WIDTH - 160 - 40;
+var ENEMY_START_Y_MIN = 220;
+var ENEMY_START_Y_MAX = GROUND_Y - 200;
+var ENEMY_START_X = GAME_WIDTH + 120;
+var LASER_COOLDOWN = 18; // ticks
+var LASER_COOLDOWN_RAPID = 6;
+var CRYSTAL_COLLECT_DIST = 120;
+var BONUS_COLLECT_DIST = 120;
+var CRYSTAL_MOVE_STEP = 180; // How much movement area expands per crystal
+var MAX_CRYSTALS = 8;
+var WAVE_ENEMY_BASE = 10;
+var WAVE_ENEMY_INC = 4;
+var WAVE_SPEED_INC = 0.4;
+var WAVE_HP_INC = 1;
+var BONUS_WAVE_INTERVAL = 3;
+var POWERUP_DURATION = 360; // 6 seconds at 60fps
+// Game state
+var player = null;
+var aliens = [];
+var lasers = [];
+var crystals = [];
+var bonuses = [];
+var dragNode = null;
+var dragOffsetX = 0;
+var dragOffsetY = 0;
+var lastMoveX = 0;
+var lastMoveY = 0;
+var lastAlienSpawnTick = 0;
+var wave = 1;
+var enemiesLeft = 0;
+var enemiesToSpawn = 0;
+var enemiesKilled = 0;
+var crystalsCollected = 0;
+var leftLimit = PLAYER_MIN_X;
+var rightLimit = PLAYER_MAX_X;
+var bonusActive = false;
+var bonusType = null;
+var score = 0;
+var scoreTxt = null;
+var waveTxt = null;
+var powerupTxt = null;
+var gameOver = false;
+var youWin = false;
+// GUI
+scoreTxt = new Text2('0', {
+	size: 120,
+	fill: 0xFFFFFF
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+waveTxt = new Text2('Wave 1', {
+	size: 80,
+	fill: 0xAAFFFF
+});
+waveTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(waveTxt);
+waveTxt.y = 120;
+powerupTxt = new Text2('', {
+	size: 70,
+	fill: 0xFFE100
+});
+powerupTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(powerupTxt);
+powerupTxt.y = 220;
+// Start music
+LK.playMusic('bgmusic');
+// Spawn player
+player = new Player();
+player.x = PLAYER_START_X;
+player.y = PLAYER_START_Y;
+game.addChild(player);
+// Set initial movement limits
+leftLimit = player.leftLimit;
+rightLimit = player.rightLimit;
+// Start first wave
+function startWave(waveNum) {
+	wave = waveNum;
+	waveTxt.setText('Wave ' + wave);
+	enemiesToSpawn = WAVE_ENEMY_BASE + (wave - 1) * WAVE_ENEMY_INC;
+	enemiesLeft = enemiesToSpawn;
+	lastAlienSpawnTick = LK.ticks;
+}
+startWave(1);
+// Utility: clamp
+function clamp(val, min, max) {
+	if (val < min) return min;
+	if (val > max) return max;
+	return val;
+}
+// Utility: random int
+function randInt(min, max) {
+	return min + Math.floor(Math.random() * (max - min + 1));
+}
+// Utility: random powerup
+function randomPowerup() {
+	var arr = ['rapid', 'pierce', 'shield'];
+	return arr[randInt(0, arr.length - 1)];
+}
+// Handle movement (dragging)
+function handleMove(x, y, obj) {
+	if (dragNode === player) {
+		// Clamp to current movement limits
+		var newX = clamp(x, leftLimit, rightLimit);
+		player.x = newX;
+		lastMoveX = newX;
+		lastMoveY = player.y;
+	}
+}
+game.move = handleMove;
+game.down = function (x, y, obj) {
+	// Only allow drag if touch/click is on player or below
+	if (y > GROUND_Y - 200) {
+		dragNode = player;
+		handleMove(x, y, obj);
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+// Main game update
+game.update = function () {
+	if (gameOver || youWin) return;
+	// Player update (powerup timer)
+	player.update();
+	// Aliens update
+	for (var i = aliens.length - 1; i >= 0; i--) {
+		var alien = aliens[i];
+		alien.update();
+		// Check if alien reached left edge (player dies)
+		if (alien.x < 0 - alien.width / 2) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+			gameOver = true;
+			return;
+		}
+		// Check collision with player (if shielded, destroy alien)
+		if (player.powered && player.powerType === 'shield' && alien.intersects(player)) {
+			LK.getSound('alien_die').play();
+			LK.effects.flashObject(alien, 0x00eaff, 400);
+			alien.isDead = true;
+			aliens.splice(i, 1);
+			alien.destroy();
+			continue;
+		}
+	}
+	// Lasers update
+	for (var i = lasers.length - 1; i >= 0; i--) {
+		var laser = lasers[i];
+		laser.update();
+		// Remove if off screen
+		if (laser.y < -100) {
+			lasers.splice(i, 1);
+			laser.destroy();
+			continue;
+		}
+		// Check collision with aliens
+		var hit = false;
+		for (var j = aliens.length - 1; j >= 0; j--) {
+			var alien = aliens[j];
+			if (!alien.isDead && laser.intersects(alien)) {
+				alien.hp -= player.powered && player.powerType === 'pierce' ? 2 : 1;
+				if (alien.hp <= 0) {
+					// Alien dies
+					LK.getSound('alien_die').play();
+					LK.effects.flashObject(alien, 0xff0000, 400);
+					alien.isDead = true;
+					// Drop crystal
+					var crystal = new Crystal();
+					crystal.x = alien.x;
+					crystal.y = alien.y;
+					crystals.push(crystal);
+					game.addChild(crystal);
+					// Remove alien
+					aliens.splice(j, 1);
+					alien.destroy();
+					enemiesLeft--;
+					enemiesKilled++;
+					score += 10;
+					scoreTxt.setText(score);
+					// New wave?
+					if (enemiesLeft <= 0) {
+						// Bonus box every BONUS_WAVE_INTERVAL
+						if (wave % BONUS_WAVE_INTERVAL === 0) {
+							var bonus = new BonusBox();
+							bonus.x = randInt(leftLimit + 100, rightLimit - 100);
+							bonus.y = randInt(ENEMY_START_Y_MIN + 100, ENEMY_START_Y_MAX - 100);
+							bonus.type = randomPowerup();
+							bonuses.push(bonus);
+							game.addChild(bonus);
+						}
+						startWave(wave + 1);
+					}
+				}
+				hit = true;
+				if (!(player.powered && player.powerType === 'pierce')) break;
+			}
+		}
+		if (hit && !(player.powered && player.powerType === 'pierce')) {
+			lasers.splice(i, 1);
+			laser.destroy();
+		}
+	}
+	// Crystals update
+	for (var i = crystals.length - 1; i >= 0; i--) {
+		var crystal = crystals[i];
+		// If player close enough, collect
+		var dx = player.x - crystal.x;
+		var dy = player.y - crystal.y;
+		var dist = Math.sqrt(dx * dx + dy * dy);
+		if (dist < CRYSTAL_COLLECT_DIST) {
+			LK.getSound('crystal_get').play();
+			LK.effects.flashObject(crystal, 0x00eaff, 400);
+			crystals.splice(i, 1);
+			crystal.destroy();
+			// Expand movement area
+			if (crystalsCollected < MAX_CRYSTALS) {
+				leftLimit = Math.max(PLAYER_MIN_X - (crystalsCollected + 1) * CRYSTAL_MOVE_STEP, 80 + player.width / 2);
+				rightLimit = Math.min(PLAYER_MAX_X + (crystalsCollected + 1) * CRYSTAL_MOVE_STEP, GAME_WIDTH - 80 - player.width / 2);
+				crystalsCollected++;
+			}
+		}
+	}
+	// Bonus boxes update
+	for (var i = bonuses.length - 1; i >= 0; i--) {
+		var bonus = bonuses[i];
+		var dx = player.x - bonus.x;
+		var dy = player.y - bonus.y;
+		var dist = Math.sqrt(dx * dx + dy * dy);
+		if (dist < BONUS_COLLECT_DIST) {
+			LK.getSound('bonus_get').play();
+			LK.effects.flashObject(bonus, 0xffe100, 400);
+			bonuses.splice(i, 1);
+			bonus.destroy();
+			// Grant powerup
+			player.setPower(bonus.type, POWERUP_DURATION);
+			if (bonus.type === 'rapid') {
+				powerupTxt.setText('Rapid Fire!');
+			} else if (bonus.type === 'pierce') {
+				powerupTxt.setText('Piercing Shots!');
+			} else if (bonus.type === 'shield') {
+				powerupTxt.setText('Shield!');
+			}
+		}
+	}
+	// Powerup text timer
+	if (player.powered) {
+		powerupTxt.alpha = 1;
+	} else {
+		if (powerupTxt.alpha > 0) {
+			powerupTxt.alpha -= 0.04;
+			if (powerupTxt.alpha < 0) powerupTxt.alpha = 0;
+		}
+		powerupTxt.setText('');
+	}
+	// Player auto-fire
+	var cooldown = player.powered && player.powerType === 'rapid' ? LASER_COOLDOWN_RAPID : LASER_COOLDOWN;
+	if (player.shootCooldown > 0) player.shootCooldown--;
+	// Find nearest alien in range
+	var nearestAlien = null;
+	var minDist = 99999;
+	for (var i = 0; i < aliens.length; i++) {
+		var alien = aliens[i];
+		var dx = alien.x - player.x;
+		var dy = alien.y - player.y;
+		var dist = Math.sqrt(dx * dx + dy * dy);
+		if (dx < 0) continue; // Only shoot aliens to the right
+		if (dist < minDist) {
+			minDist = dist;
+			nearestAlien = alien;
+		}
+	}
+	if (nearestAlien && player.shootCooldown <= 0) {
+		// Fire laser
+		var laser = new Laser();
+		laser.x = player.x;
+		laser.y = player.y - player.height / 2 + 10;
+		if (player.powered && player.powerType === 'pierce') {
+			laser.pierce = true;
+		}
+		lasers.push(laser);
+		game.addChild(laser);
+		player.shootCooldown = cooldown;
+		LK.getSound('laser_shoot').play();
+	}
+	// Spawn aliens for current wave
+	if (enemiesToSpawn > 0 && LK.ticks - lastAlienSpawnTick > 24) {
+		var alien = new Alien();
+		alien.x = ENEMY_START_X;
+		alien.y = randInt(ENEMY_START_Y_MIN, ENEMY_START_Y_MAX);
+		alien.wave = wave;
+		alien.speed = 2.5 + (wave - 1) * WAVE_SPEED_INC;
+		alien.hp = 1 + Math.floor((wave - 1) * WAVE_HP_INC / 2);
+		aliens.push(alien);
+		game.addChild(alien);
+		enemiesToSpawn--;
+		lastAlienSpawnTick = LK.ticks;
+	}
+};
\ No newline at end of file