===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,384 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Enemy Shell
+var EnemyShell = Container.expand(function () {
+	var self = Container.call(this);
+	var shell = self.attachAsset('enemyShell', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = shell.width;
+	self.height = shell.height;
+	self.speed = 22 + Math.random() * 6;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Enemy Tank
+var EnemyTank = Container.expand(function () {
+	var self = Container.call(this);
+	var tank = self.attachAsset('enemyTank', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = tank.width;
+	self.height = tank.height;
+	self.speed = 6 + Math.random() * enemySpeedIncrease;
+	self.shootCooldown = 60 + Math.floor(Math.random() * 60);
+	self.update = function () {
+		self.y += self.speed;
+		if (self.shootCooldown > 0) {
+			self.shootCooldown--;
+		} else {
+			self.shoot();
+			self.shootCooldown = 90 + Math.floor(Math.random() * 60);
+		}
+	};
+	self.shoot = function () {
+		var shell = new EnemyShell();
+		shell.x = self.x;
+		shell.y = self.y + self.height / 2 + shell.height / 2;
+		enemyShells.push(shell);
+		game.addChild(shell);
+		LK.getSound('enemyFire').play();
+	};
+	return self;
+});
+// Explosion (visual effect only)
+var Explosion = Container.expand(function () {
+	var self = Container.call(this);
+	var exp = self.attachAsset('explosion', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		scaleX: 0.5,
+		scaleY: 0.5,
+		alpha: 0.8
+	});
+	self.width = exp.width;
+	self.height = exp.height;
+	// Animate explosion
+	tween(exp, {
+		scaleX: 1.5,
+		scaleY: 1.5,
+		alpha: 0
+	}, {
+		duration: 400,
+		easing: tween.easeOut,
+		onFinish: function onFinish() {
+			self.destroy();
+		}
+	});
+	return self;
+});
+// Player Shell
+var PlayerShell = Container.expand(function () {
+	var self = Container.call(this);
+	var shell = self.attachAsset('playerShell', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = shell.width;
+	self.height = shell.height;
+	self.speed = -32;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Player Tank
+var PlayerTank = Container.expand(function () {
+	var self = Container.call(this);
+	var tank = self.attachAsset('playerTank', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = tank.width;
+	self.height = tank.height;
+	self.shootCooldown = 0;
+	self.poweredUp = false;
+	self.powerupTimer = 0;
+	// Shoot method
+	self.shoot = function () {
+		if (self.shootCooldown > 0) return;
+		var shell = new PlayerShell();
+		shell.x = self.x;
+		shell.y = self.y - self.height / 2 - shell.height / 2;
+		playerShells.push(shell);
+		game.addChild(shell);
+		LK.getSound('fire').play();
+		self.shootCooldown = self.poweredUp ? 10 : 20; // Faster fire if powered up
+	};
+	// Powerup method
+	self.activatePowerup = function () {
+		self.poweredUp = true;
+		self.powerupTimer = 360; // 6 seconds at 60fps
+		tween(self, {
+			scaleX: 1.2,
+			scaleY: 1.2
+		}, {
+			duration: 200,
+			easing: tween.elasticOut
+		});
+	};
+	self.deactivatePowerup = function () {
+		self.poweredUp = false;
+		tween(self, {
+			scaleX: 1,
+			scaleY: 1
+		}, {
+			duration: 200,
+			easing: tween.elasticIn
+		});
+	};
+	// Update
+	self.update = function () {
+		if (self.shootCooldown > 0) self.shootCooldown--;
+		if (self.poweredUp) {
+			self.powerupTimer--;
+			if (self.powerupTimer <= 0) self.deactivatePowerup();
+		}
+	};
+	return self;
+});
+// Powerup
+var Powerup = Container.expand(function () {
+	var self = Container.call(this);
+	var p = self.attachAsset('powerup', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = p.width;
+	self.height = p.height;
+	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: 0x22272a
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sounds
+// Explosion (for effect)
+// Powerup
+// Enemy Shell
+// Enemy Tank
+// Player Shell
+// Player Tank
+// Play music
+LK.playMusic('battleTheme');
+// Score
+var score = 0;
+var scoreTxt = new Text2('0', {
+	size: 120,
+	fill: '#fff'
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+// Player
+var player = new PlayerTank();
+player.x = 2048 / 2;
+player.y = 2732 - 300;
+game.addChild(player);
+// Arrays for game objects
+var playerShells = [];
+var enemyTanks = [];
+var enemyShells = [];
+var powerups = [];
+var explosions = [];
+// Difficulty
+var enemySpawnTimer = 0;
+var enemySpawnInterval = 90;
+var enemySpeedIncrease = 0;
+var powerupTimer = 0;
+// Dragging
+var dragNode = null;
+// Move handler
+function handleMove(x, y, obj) {
+	if (dragNode) {
+		// Clamp tank inside game area (leave 100px margin at top for UI)
+		var minX = player.width / 2;
+		var maxX = 2048 - player.width / 2;
+		var minY = 100 + player.height / 2;
+		var maxY = 2732 - player.height / 2;
+		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/click is on player tank
+	var local = player.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
+	if (Math.abs(local.x) <= player.width / 2 && Math.abs(local.y) <= player.height / 2) {
+		dragNode = player;
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+// Tap to shoot (anywhere)
+game.tap = function (x, y, obj) {
+	player.shoot();
+};
+// For mobile: allow shooting by tapping anywhere except on UI
+game.down = function (x, y, obj) {
+	// If tap is not on top UI, shoot
+	if (y > 180) player.shoot();
+	// Also allow drag
+	var local = player.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
+	if (Math.abs(local.x) <= player.width / 2 && Math.abs(local.y) <= player.height / 2) {
+		dragNode = player;
+	}
+};
+// Main update loop
+game.update = function () {
+	// Player update
+	player.update();
+	// Player shells
+	for (var i = playerShells.length - 1; i >= 0; i--) {
+		var shell = playerShells[i];
+		shell.update();
+		// Remove if off screen
+		if (shell.y < -shell.height) {
+			shell.destroy();
+			playerShells.splice(i, 1);
+			continue;
+		}
+		// Check collision with enemy tanks
+		for (var j = enemyTanks.length - 1; j >= 0; j--) {
+			var enemy = enemyTanks[j];
+			if (shell.intersects(enemy)) {
+				// Explosion
+				var exp = new Explosion();
+				exp.x = enemy.x;
+				exp.y = enemy.y;
+				game.addChild(exp);
+				explosions.push(exp);
+				LK.getSound('explode').play();
+				// Remove both
+				enemy.destroy();
+				shell.destroy();
+				enemyTanks.splice(j, 1);
+				playerShells.splice(i, 1);
+				// Score
+				score++;
+				scoreTxt.setText(score);
+				// Increase difficulty
+				if (score % 10 === 0) {
+					enemySpeedIncrease += 2;
+					if (enemySpawnInterval > 30) enemySpawnInterval -= 5;
+				}
+				// Win condition
+				if (score >= 50) {
+					LK.showYouWin();
+					return;
+				}
+				break;
+			}
+		}
+	}
+	// Enemy tanks
+	for (var i = enemyTanks.length - 1; i >= 0; i--) {
+		var enemy = enemyTanks[i];
+		enemy.update();
+		// Remove if off screen
+		if (enemy.y > 2732 + enemy.height) {
+			enemy.destroy();
+			enemyTanks.splice(i, 1);
+			continue;
+		}
+		// Collision with player
+		if (enemy.intersects(player)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Enemy shells
+	for (var i = enemyShells.length - 1; i >= 0; i--) {
+		var shell = enemyShells[i];
+		shell.update();
+		// Remove if off screen
+		if (shell.y > 2732 + shell.height) {
+			shell.destroy();
+			enemyShells.splice(i, 1);
+			continue;
+		}
+		// Collision with player
+		if (shell.intersects(player)) {
+			LK.effects.flashScreen(0xff0000, 800);
+			LK.showGameOver();
+			return;
+		}
+	}
+	// Powerups
+	for (var i = powerups.length - 1; i >= 0; i--) {
+		var p = powerups[i];
+		p.update();
+		// Remove if off screen
+		if (p.y > 2732 + p.height) {
+			p.destroy();
+			powerups.splice(i, 1);
+			continue;
+		}
+		// Collision with player
+		if (p.intersects(player)) {
+			LK.getSound('powerup').play();
+			player.activatePowerup();
+			p.destroy();
+			powerups.splice(i, 1);
+		}
+	}
+	// Explosions (auto-destroyed by tween)
+	// Spawn enemy tanks
+	enemySpawnTimer--;
+	if (enemySpawnTimer <= 0) {
+		var enemy = new EnemyTank();
+		enemy.x = 200 + Math.random() * (2048 - 400);
+		enemy.y = -enemy.height / 2;
+		enemyTanks.push(enemy);
+		game.addChild(enemy);
+		enemySpawnTimer = enemySpawnInterval + Math.floor(Math.random() * 40);
+	}
+	// Spawn powerups
+	powerupTimer--;
+	if (powerupTimer <= 0) {
+		if (Math.random() < 0.25) {
+			// 25% chance
+			var p = new Powerup();
+			p.x = 200 + Math.random() * (2048 - 400);
+			p.y = -p.height / 2;
+			powerups.push(p);
+			game.addChild(p);
+		}
+		powerupTimer = 600 + Math.floor(Math.random() * 600); // 10-20 seconds
+	}
+};
+// Initial timers
+enemySpawnTimer = 60;
+powerupTimer = 900;
+// Prevent UI overlap (top left 100x100 reserved)
+scoreTxt.x = 2048 / 2;
+scoreTxt.y = 20;
\ No newline at end of file