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

/**** 
* Classes
****/ 
// Alien
var Alien = Container.expand(function () {
	var self = Container.call(this);
	var alien = self.attachAsset('alien', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = alien.width;
	self.height = alien.height;
	self.row = 0;
	self.col = 0;
	self.alive = true;
	self.shootCooldown = 0;
	self.update = function () {
		// No per-alien update needed; movement handled by global logic
	};
	self.shoot = function () {
		var bullet = new AlienBullet();
		bullet.x = self.x;
		bullet.y = self.y + self.height / 2 + bullet.height / 2;
		alienBullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('alienShoot').play();
	};
	self.hit = function () {
		self.alive = false;
		LK.getSound('explosion').play();
		LK.effects.flashObject(self, 0xffffff, 200);
		self.visible = false;
	};
	return self;
});
// Alien Bullet
var AlienBullet = Container.expand(function () {
	var self = Container.call(this);
	var bullet = self.attachAsset('alienBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bullet.width;
	self.height = bullet.height;
	self.speed = 28; // Increased speed for harder gameplay
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Bullet
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bullet = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bullet.width;
	self.height = bullet.height;
	self.speed = -32;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Ship
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	var ship = self.attachAsset('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ship.width;
	self.height = ship.height;
	self.canShoot = true;
	self.shootCooldown = 18; // frames between shots
	self.cooldownTimer = 0;
	self.lives = 3;
	self.invincible = false;
	self.invincibleTimer = 0;
	self.update = function () {
		if (self.cooldownTimer > 0) self.cooldownTimer--;
		if (self.invincible) {
			self.invincibleTimer--;
			if (self.invincibleTimer <= 0) {
				self.invincible = false;
				ship.alpha = 1;
			} else {
				ship.alpha = LK.ticks % 10 < 5 ? 0.4 : 1;
			}
		}
	};
	self.shoot = function () {
		if (self.cooldownTimer === 0 && self.visible) {
			self.cooldownTimer = self.shootCooldown;
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - self.height / 2 - bullet.height / 2;
			playerBullets.push(bullet);
			game.addChild(bullet);
			LK.getSound('shoot').play();
		}
	};
	self.hit = function () {
		if (self.invincible) return;
		self.lives--;
		if (typeof updateLivesDisplay === "function") updateLivesDisplay();
		if (self.lives <= 0) {
			LK.effects.flashScreen(0xff0000, 800);
			LK.getSound('explosion').play();
			LK.showGameOver();
		} else {
			self.invincible = true;
			self.invincibleTimer = 90;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Music
// Sound effects
// Powerup: purple ellipse
// Alien bullet: red ellipse
// Alien: green box
// Player bullet: yellow ellipse
// Player ship: blue box
// Play music
LK.playMusic('spacesong1', {
	loop: true
});
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Lives display
var livesTxt = new Text2('♥ x3', {
	size: 90,
	fill: 0xFF6666
});
livesTxt.anchor.set(0, 0);
livesTxt.x = 120;
livesTxt.y = 0;
LK.gui.top.addChild(livesTxt);
// Helper to update lives display
function updateLivesDisplay() {
	livesTxt.setText('♥ x' + player.lives);
}
// Player
var player = new PlayerShip();
player.x = 2048 / 2;
player.y = 2732 - 180;
game.addChild(player);
if (typeof updateLivesDisplay === "function") updateLivesDisplay();
// Bullets and objects
var playerBullets = [];
var alienBullets = [];
var aliens = [];
// Alien grid
var alienRows = 5;
var alienCols = 8;
var alienSpacingX = 180;
var alienSpacingY = 120;
var alienStartX = (2048 - (alienCols - 1) * alienSpacingX) / 2;
var alienStartY = 320;
var alienDir = 1; // 1: right, -1: left
var alienSpeed = 12; // px per move
var alienMoveDown = 60; // px to move down when hitting edge
var alienMoveTimer = 0;
var alienMoveInterval = 32; // frames between moves, decreases as aliens die
var alienShootChance = 0.018; // chance per alien per move to shoot (increased for more frequent fire)
function spawnAliens() {
	aliens.length = 0;
	for (var row = 0; row < alienRows; row++) {
		for (var col = 0; col < alienCols; col++) {
			var a = new Alien();
			a.row = row;
			a.col = col;
			a.x = alienStartX + col * alienSpacingX;
			a.y = alienStartY + row * alienSpacingY;
			aliens.push(a);
			game.addChild(a);
		}
	}
}
spawnAliens();
// Dragging
var dragging = false;
var dragOffsetX = 0;
// Move handler
function handleMove(x, y, obj) {
	if (dragging) {
		var newX = x - dragOffsetX;
		// Clamp to screen
		var minX = player.width / 2 + 20;
		var maxX = 2048 - player.width / 2 - 20;
		player.x = Math.max(minX, Math.min(maxX, newX));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Only drag if touch is on player
	var local = player.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x > -player.width / 2 && local.x < player.width / 2 && local.y > -player.height / 2 && local.y < player.height / 2) {
		dragging = true;
		dragOffsetX = x - player.x;
	}
};
game.up = function (x, y, obj) {
	dragging = false;
};
// Tap to shoot
game.tap = function (x, y, obj) {
	player.shoot();
};
// For mobile: allow tap anywhere to shoot
game.down = function (x, y, obj) {
	// Drag if on player, else shoot
	var local = player.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x > -player.width / 2 && local.x < player.width / 2 && local.y > -player.height / 2 && local.y < player.height / 2) {
		dragging = true;
		dragOffsetX = x - player.x;
	} else {
		player.shoot();
	}
};
// Main update loop
game.update = function () {
	// Player update
	player.update();
	// Player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		b.update();
		if (b.y < -b.height) {
			b.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Collide with aliens
		for (var j = 0; j < aliens.length; j++) {
			var a = aliens[j];
			if (a.alive && b.intersects(a)) {
				a.hit();
				b.destroy();
				playerBullets.splice(i, 1);
				score += 100;
				scoreTxt.setText(score);
				break;
			}
		}
	}
	// Alien bullets
	for (var i = alienBullets.length - 1; i >= 0; i--) {
		var b = alienBullets[i];
		b.update();
		if (b.y > 2732 + b.height) {
			b.destroy();
			alienBullets.splice(i, 1);
			continue;
		}
		// Collide with player
		if (b.intersects(player) && !player.invincible) {
			b.destroy();
			alienBullets.splice(i, 1);
			player.hit();
			break;
		}
	}
	// Aliens movement
	alienMoveTimer++;
	if (alienMoveTimer >= alienMoveInterval) {
		alienMoveTimer = 0;
		var minX = 99999,
			maxX = -99999;
		var minY = 99999,
			maxY = -99999;
		for (var i = 0; i < aliens.length; i++) {
			var a = aliens[i];
			if (!a.alive) continue;
			minX = Math.min(minX, a.x - a.width / 2);
			maxX = Math.max(maxX, a.x + a.width / 2);
			minY = Math.min(minY, a.y - a.height / 2);
			maxY = Math.max(maxY, a.y + a.height / 2);
		}
		var edgeHit = false;
		if (alienDir === 1 && maxX + alienSpeed > 2048 - 40) edgeHit = true;
		if (alienDir === -1 && minX - alienSpeed < 40) edgeHit = true;
		if (edgeHit) {
			alienDir *= -1;
			for (var i = 0; i < aliens.length; i++) {
				var a = aliens[i];
				if (a.alive) a.y += alienMoveDown;
			}
		} else {
			for (var i = 0; i < aliens.length; i++) {
				var a = aliens[i];
				if (a.alive) a.x += alienDir * alienSpeed;
			}
		}
		// Aliens shoot
		for (var i = 0; i < aliens.length; i++) {
			var a = aliens[i];
			if (!a.alive) continue;
			// Only bottom-most alien in column can shoot
			var isLowest = true;
			for (var j = 0; j < aliens.length; j++) {
				var b = aliens[j];
				if (b.col === a.col && b.row > a.row && b.alive) {
					isLowest = false;
					break;
				}
			}
			if (isLowest && Math.random() < alienShootChance) {
				a.shoot();
			}
		}
		// Check for aliens reaching bottom
		for (var i = 0; i < aliens.length; i++) {
			var a = aliens[i];
			if (a.alive && a.y + a.height / 2 >= player.y - player.height / 2) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			}
		}
		// Speed up as aliens die
		var aliveCount = 0;
		for (var i = 0; i < aliens.length; i++) if (aliens[i].alive) aliveCount++;
		alienMoveInterval = Math.max(4, 32 - Math.floor((40 - aliveCount) / 2)); // Lower minimum interval for faster movement
	}
	// Infinite mode: respawn new wave and increase difficulty
	var allDead = true;
	for (var i = 0; i < aliens.length; i++) if (aliens[i].alive) allDead = false;
	if (allDead) {
		LK.effects.flashScreen(0x00ff00, 600);
		// Increase difficulty: more rows, faster, more chance to shoot
		if (alienRows < 8) alienRows++;
		if (alienCols < 12) alienCols++;
		alienShootChance = Math.min(0.06, alienShootChance + 0.004); // Increase max and ramp
		alienMoveInterval = Math.max(3, alienMoveInterval - 3); // Faster ramp
		spawnAliens();
		// Remove all remaining alien bullets
		for (var i = alienBullets.length - 1; i >= 0; i--) {
			alienBullets[i].destroy();
			alienBullets.splice(i, 1);
		}
		// Remove all player bullets
		for (var i = playerBullets.length - 1; i >= 0; i--) {
			playerBullets[i].destroy();
			playerBullets.splice(i, 1);
		}
		// Reset alien movement
		alienMoveTimer = 0;
		// Give player a bonus life every 3 cleared waves (max 5)
		if (typeof wavesCleared === "undefined") wavesCleared = 0;
		wavesCleared++;
		if (wavesCleared % 3 === 0 && player.lives < 5) {
			player.lives++;
			LK.effects.flashObject(player, 0x66ff66, 800);
			if (typeof updateLivesDisplay === "function") updateLivesDisplay();
		}
		return;
	}
};
// Set initial score
LK.setScore(0);
scoreTxt.setText(0);

===================================================================
--- original.js
+++ change.js
@@ -132,17 +132,19 @@
 
 /**** 
 * Game Code
 ****/ 
-// Play music
-// Player ship: blue box
-// Player bullet: yellow ellipse
-// Alien: green box
-// Alien bullet: red ellipse
-// Powerup: purple ellipse
-// Sound effects
 // Music
-LK.playMusic('spaceMusic');
+// Sound effects
+// Powerup: purple ellipse
+// Alien bullet: red ellipse
+// Alien: green box
+// Player bullet: yellow ellipse
+// Player ship: blue box
+// Play music
+LK.playMusic('spacesong1', {
+	loop: true
+});
 // Score
 var score = 0;
 var scoreTxt = new Text2('0', {
 	size: 120,