/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.direction = 1;
	self.moveDownDistance = 60;
	self.shootChance = 0.001;
	self.points = 10;
	self.lastShoot = 0;
	self.update = function () {
		self.x += self.speed * self.direction;
	};
	self.moveDown = function () {
		self.y += self.moveDownDistance;
		self.direction *= -1;
	};
	return self;
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.directionX = 0;
	self.directionY = self.speed;
	self.update = function () {
		self.x += self.directionX;
		self.y += self.directionY;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.lastShoot = 0;
	self.shootDelay = 15;
	self.lives = 3;
	self.invulnerable = false;
	self.invulnerableTime = 0;
	self.shoot = function () {
		if (LK.ticks - self.lastShoot > self.shootDelay) {
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - 40;
			playerBullets.push(bullet);
			game.addChild(bullet);
			self.lastShoot = LK.ticks;
			LK.getSound('shoot').play();
		}
	};
	self.takeDamage = function () {
		if (!self.invulnerable) {
			self.lives--;
			self.invulnerable = true;
			self.invulnerableTime = LK.ticks + 120; // 2 seconds of invulnerability
			LK.effects.flashObject(self, 0xff0000, 500);
			LK.getSound('playerHit').play();
			livesText.setText('Lives: ' + self.lives);
			if (self.lives <= 0) {
				LK.showGameOver();
			}
		}
	};
	self.update = function () {
		if (self.invulnerable && LK.ticks > self.invulnerableTime) {
			self.invulnerable = false;
		}
	};
	return self;
});
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -12;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var powerupGraphics = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.type = 'rapidfire'; // Default type
	self.update = function () {
		self.y += self.speed;
		self.rotation += 0.1;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000033
});

/**** 
* Game Code
****/ 
var player = new Player();
player.x = 1024;
player.y = 2500;
game.addChild(player);
var playerBullets = [];
var enemyBullets = [];
var enemies = [];
var powerups = [];
var currentWave = 1;
var enemiesKilled = 0;
var waveEnemyCount = 0;
var dragNode = null;
var rapidFireEndTime = 0;
var currentShootingEnemyIndex = 0;
var enemyShootTimer = 0;
var enemyShootInterval = 90; // Shoot every 1.5 seconds (90 ticks at 60fps)
// UI Elements
var scoreText = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0, 0);
scoreText.x = 50;
scoreText.y = 50;
LK.gui.topLeft.addChild(scoreText);
var livesText = new Text2('Lives: 3', {
	size: 80,
	fill: 0xFFFFFF
});
livesText.anchor.set(1, 0);
LK.gui.topRight.addChild(livesText);
var waveText = new Text2('Wave: 1', {
	size: 80,
	fill: 0xFFFFFF
});
waveText.anchor.set(0.5, 0);
LK.gui.top.addChild(waveText);
function spawnWave() {
	enemies = [];
	var rows = Math.min(2 + Math.floor(currentWave / 4), 4);
	var cols = Math.min(4 + Math.floor(currentWave / 3), 6);
	waveEnemyCount = rows * cols;
	enemiesKilled = 0;
	currentShootingEnemyIndex = 0; // Reset shooting order for new wave
	enemyShootTimer = 0; // Reset shoot timer
	var startX = (2048 - (cols - 1) * 120) / 2;
	var startY = 200;
	for (var row = 0; row < rows; row++) {
		for (var col = 0; col < cols; col++) {
			var enemy = new Enemy();
			enemy.x = startX + col * 120;
			enemy.y = startY + row * 80;
			enemy.speed = 1 + currentWave * 0.3;
			enemy.shootChance = 0.0005 + currentWave * 0.0002;
			enemies.push(enemy);
			game.addChild(enemy);
		}
	}
	waveText.setText('Wave: ' + currentWave);
}
function checkWaveComplete() {
	if (enemiesKilled >= waveEnemyCount) {
		currentWave++;
		LK.setTimeout(function () {
			spawnWave();
		}, 2000);
	}
}
function handleMove(x, y, obj) {
	if (dragNode) {
		var targetX = Math.max(40, Math.min(2008, x));
		tween.stop(dragNode, {
			x: true
		});
		tween(dragNode, {
			x: targetX
		}, {
			duration: 500,
			easing: tween.easeOut
		});
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	dragNode = player;
	handleMove(x, y, obj);
	player.shoot();
};
game.up = function (x, y, obj) {
	dragNode = null;
};
game.update = function () {
	// Check if rapid fire is active
	var isRapidFire = LK.ticks < rapidFireEndTime;
	if (isRapidFire) {
		player.shootDelay = 5;
	} else {
		player.shootDelay = 15;
	}
	// Update player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var bullet = playerBullets[i];
		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
		// Remove bullets that go off screen
		if (bullet.lastY >= -10 && bullet.y < -10) {
			bullet.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		var hitEnemy = false;
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullet.intersects(enemies[j])) {
				LK.setScore(LK.getScore() + enemies[j].points);
				scoreText.setText('Score: ' + LK.getScore());
				LK.getSound('enemyHit').play();
				// Chance to drop power-up
				if (Math.random() < 0.1) {
					var powerup = new PowerUp();
					powerup.x = enemies[j].x;
					powerup.y = enemies[j].y;
					powerups.push(powerup);
					game.addChild(powerup);
				}
				enemies[j].destroy();
				enemies.splice(j, 1);
				enemiesKilled++;
				hitEnemy = true;
				break;
			}
		}
		if (hitEnemy) {
			bullet.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		bullet.lastY = bullet.y;
	}
	// Update enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var bullet = enemyBullets[i];
		if (bullet.lastY === undefined) bullet.lastY = bullet.y;
		// Remove bullets that go off screen
		if (bullet.lastY <= 2742 && bullet.y > 2742) {
			bullet.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (bullet.intersects(player)) {
			player.takeDamage();
			bullet.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		bullet.lastY = bullet.y;
	}
	// Handle alternating enemy shooting
	enemyShootTimer++;
	if (enemyShootTimer >= enemyShootInterval && enemies.length > 0) {
		// Reset timer
		enemyShootTimer = 0;
		// Find next valid enemy to shoot
		var attempts = 0;
		var maxAttempts = enemies.length;
		while (attempts < maxAttempts) {
			// Make sure index is within bounds
			if (currentShootingEnemyIndex >= enemies.length) {
				currentShootingEnemyIndex = 0;
			}
			var shootingEnemy = enemies[currentShootingEnemyIndex];
			if (shootingEnemy && shootingEnemy.y < 2000) {
				// Only shoot if enemy is not too low
				// Create bullet from this enemy
				var bullet = new EnemyBullet();
				bullet.x = shootingEnemy.x;
				bullet.y = shootingEnemy.y + 30;
				// Calculate direction towards player
				var deltaX = player.x - shootingEnemy.x;
				var deltaY = player.y - shootingEnemy.y;
				var distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
				// Normalize direction and apply speed
				bullet.directionX = deltaX / distance * bullet.speed;
				bullet.directionY = deltaY / distance * bullet.speed;
				enemyBullets.push(bullet);
				game.addChild(bullet);
				break;
			}
			// Move to next enemy
			currentShootingEnemyIndex = (currentShootingEnemyIndex + 1) % enemies.length;
			attempts++;
		}
		// Move to next enemy for next turn
		currentShootingEnemyIndex = (currentShootingEnemyIndex + 1) % enemies.length;
	}
	// Update enemies
	var shouldMoveDown = false;
	for (var i = 0; i < enemies.length; i++) {
		var enemy = enemies[i];
		if (enemy.x <= 60 || enemy.x >= 1988) {
			shouldMoveDown = true;
			break;
		}
	}
	if (shouldMoveDown) {
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].moveDown();
		}
	}
	// Check if enemies reached player
	for (var i = 0; i < enemies.length; i++) {
		if (enemies[i].y > 2300 && enemies[i].intersects(player)) {
			player.takeDamage();
		}
	}
	// Update power-ups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var powerup = powerups[i];
		if (powerup.lastY === undefined) powerup.lastY = powerup.y;
		// Remove power-ups that go off screen
		if (powerup.lastY <= 2742 && powerup.y > 2742) {
			powerup.destroy();
			powerups.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (powerup.intersects(player)) {
			if (powerup.type === 'rapidfire') {
				rapidFireEndTime = LK.ticks + 300; // 5 seconds of rapid fire
			}
			LK.getSound('powerupCollect').play();
			powerup.destroy();
			powerups.splice(i, 1);
			continue;
		}
		powerup.lastY = powerup.y;
	}
	checkWaveComplete();
};
// Start first wave
spawnWave();

===================================================================
--- original.js
+++ change.js
@@ -33,10 +33,13 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = 8;
+	self.directionX = 0;
+	self.directionY = self.speed;
 	self.update = function () {
-		self.y += self.speed;
+		self.x += self.directionX;
+		self.y += self.directionY;
 	};
 	return self;
 });
 var Player = Container.expand(function () {
@@ -295,8 +298,15 @@
 				// Create bullet from this enemy
 				var bullet = new EnemyBullet();
 				bullet.x = shootingEnemy.x;
 				bullet.y = shootingEnemy.y + 30;
+				// Calculate direction towards player
+				var deltaX = player.x - shootingEnemy.x;
+				var deltaY = player.y - shootingEnemy.y;
+				var distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
+				// Normalize direction and apply speed
+				bullet.directionX = deltaX / distance * bullet.speed;
+				bullet.directionY = deltaY / distance * bullet.speed;
 				enemyBullets.push(bullet);
 				game.addChild(bullet);
 				break;
 			}