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

/**** 
* Classes
****/ 
// Enemy
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	// type: 1,2,3
	self.type = 1;
	self.row = 0;
	self.col = 0;
	self.isDiving = false;
	self.diveTargetX = 0;
	self.diveTargetY = 0;
	self.diveStep = 0;
	self.diveSpeed = 0;
	self.baseX = 0;
	self.baseY = 0;
	self.direction = 1; // 1: right, -1: left
	self.bulletCooldown = 0;
	self.alive = true;
	self.asset = null;
	self.init = function (type) {
		self.type = type;
		var assetId = 'enemy' + type;
		self.asset = self.attachAsset(assetId, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		self.width = self.asset.width;
		self.height = self.asset.height;
	};
	self.startDive = function (targetX, targetY, speed) {
		self.isDiving = true;
		self.diveTargetX = targetX;
		self.diveTargetY = targetY;
		self.diveStep = 0;
		self.diveSpeed = speed;
	};
	self.update = function () {
		if (!self.alive) return;
		// Remove dive logic: enemies never enter isDiving state
		self.isDiving = false;
		// Bullet cooldown
		if (self.bulletCooldown > 0) self.bulletCooldown--;
	};
	return self;
});
// Enemy Bullet
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bullet = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 6; // slower enemy bullet speed
	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.speed = -38;
	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.speed = 22;
	self.canShoot = true;
	self.shootCooldown = 0;
	self.update = function () {
		// Cooldown for shooting
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
			if (self.shootCooldown === 0) self.canShoot = true;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000010
});

/**** 
* Game Code
****/ 
// Game constants
// Spaceship (player)
// Enemy types
// Bullets
// Sounds
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var ENEMY_ROWS = 5;
var ENEMY_COLS = 8;
var ENEMY_SPACING_X = 180;
var ENEMY_SPACING_Y = 160;
var ENEMY_START_Y = 320;
var ENEMY_START_X = (GAME_WIDTH - (ENEMY_COLS - 1) * ENEMY_SPACING_X) / 2 + ENEMY_SPACING_X / 2;
var ENEMY_MOVE_STEP = 32;
var ENEMY_MOVE_DOWN = 60;
var ENEMY_MOVE_INTERVAL = 32; // ticks
var ENEMY_DIVE_INTERVAL = 120; // ticks
var ENEMY_BULLET_CHANCE = 0.004; // per update per enemy (reduced for less frequent shooting)
var PLAYER_Y = GAME_HEIGHT - 220;
var PLAYER_SHOOT_COOLDOWN = 18; // ticks
// Game state
var playerShip = null;
var playerBullets = [];
var enemyBullets = [];
var enemies = [];
var enemyDirection = 1; // 1: right, -1: left
var enemyMoveTick = 0;
var enemyDiveTick = 0;
var dragNode = null;
var scoreTxt = null;
var lastIntersecting = false;
var gameOver = false;
var wave = 1;
// Score display
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Wave display
var waveTxt = new Text2('Wave 1', {
	size: 80,
	fill: "#fff"
});
waveTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(waveTxt);
waveTxt.y = 120;
// Initialize player
playerShip = new PlayerShip();
game.addChild(playerShip);
playerShip.x = GAME_WIDTH / 2;
playerShip.y = PLAYER_Y;
// Initialize enemies
function spawnEnemies() {
	for (var row = 0; row < ENEMY_ROWS; row++) {
		for (var col = 0; col < ENEMY_COLS; col++) {
			var type = row === 0 ? 3 : row < 3 ? 2 : 1;
			var enemy = new Enemy();
			enemy.init(type);
			enemy.row = row;
			enemy.col = col;
			enemy.baseX = ENEMY_START_X + col * ENEMY_SPACING_X;
			enemy.baseY = ENEMY_START_Y + row * ENEMY_SPACING_Y;
			enemy.x = enemy.baseX;
			enemy.y = enemy.baseY;
			enemy.direction = 1;
			enemy.isDiving = false;
			enemy.alive = true;
			enemies.push(enemy);
			game.addChild(enemy);
		}
	}
}
spawnEnemies();
// Handle player movement (dragging)
function handleMove(x, y, obj) {
	if (gameOver) return;
	if (dragNode === playerShip) {
		// Only move horizontally, clamp to game area
		var minX = playerShip.width / 2 + 100;
		var maxX = GAME_WIDTH - playerShip.width / 2;
		var newX = Math.max(minX, Math.min(maxX, x));
		playerShip.x = newX;
		playerShip.y = PLAYER_Y; // Always keep Y fixed
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	if (gameOver) return;
	// Only allow drag if touch is on player ship
	var local = playerShip.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x >= -playerShip.width / 2 && local.x <= playerShip.width / 2 && local.y >= -playerShip.height / 2 && local.y <= playerShip.height / 2) {
		dragNode = playerShip;
	} else {
		// If not dragging, treat as shoot
		shootPlayerBullet();
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Handle shooting (tap anywhere)
game.tap = function (x, y, obj) {
	if (gameOver) return;
	shootPlayerBullet();
};
// For mobile, also allow shooting on down if not dragging
// (Handled by drag logic above: only set dragNode if on ship, otherwise do nothing)
// Player shooting
function shootPlayerBullet() {
	if (!playerShip.canShoot || gameOver) return;
	var bullet = new PlayerBullet();
	bullet.x = playerShip.x;
	bullet.y = playerShip.y - playerShip.height / 2 - 20;
	playerBullets.push(bullet);
	game.addChild(bullet);
	playerShip.canShoot = false;
	playerShip.shootCooldown = PLAYER_SHOOT_COOLDOWN;
	LK.getSound('shoot').play();
}
// Enemy shooting
function shootEnemyBullet(enemy) {
	var bullet = new EnemyBullet();
	bullet.x = enemy.x;
	bullet.y = enemy.y + enemy.height / 2 + 20;
	enemyBullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('enemyShoot').play();
}
// Enemy movement and dive logic
function updateEnemies() {
	// Move formation
	if (enemyMoveTick <= 0) {
		// Find leftmost and rightmost alive enemy
		var minX = GAME_WIDTH,
			maxX = 0;
		for (var i = 0; i < enemies.length; i++) {
			var e = enemies[i];
			if (!e.alive || e.isDiving) continue;
			if (e.x < minX) minX = e.x;
			if (e.x > maxX) maxX = e.x;
		}
		var moveEdge = false;
		if (enemyDirection === 1 && maxX + ENEMY_MOVE_STEP > GAME_WIDTH - 40) moveEdge = true;
		if (enemyDirection === -1 && minX - ENEMY_MOVE_STEP < 140) moveEdge = true;
		for (var i = 0; i < enemies.length; i++) {
			var e = enemies[i];
			if (!e.alive || e.isDiving) continue;
			if (moveEdge) {
				e.y += ENEMY_MOVE_DOWN;
			} else {
				e.x += ENEMY_MOVE_STEP * enemyDirection;
				e.baseX = e.x;
			}
		}
		if (moveEdge) enemyDirection *= -1;
		enemyMoveTick = Math.max(ENEMY_MOVE_INTERVAL - wave * 2, 10);
	} else {
		enemyMoveTick--;
	}
	// Dive logic removed: enemies never sortie downward
	enemyDiveTick = 0;
	// Enemy shooting
	for (var i = 0; i < enemies.length; i++) {
		var e = enemies[i];
		if (!e.alive) continue;
		if (!e.isDiving && e.bulletCooldown <= 0 && Math.random() < ENEMY_BULLET_CHANCE) {
			shootEnemyBullet(e);
			e.bulletCooldown = 64 + Math.floor(Math.random() * 32);
		}
	}
}
// Collision detection
function checkCollision(a, b) {
	// Simple AABB
	return a.x - a.width / 2 < b.x + b.width / 2 && a.x + a.width / 2 > b.x - b.width / 2 && a.y - a.height / 2 < b.y + b.height / 2 && a.y + a.height / 2 > b.y - b.height / 2;
}
// Game update
game.update = function () {
	if (gameOver) return;
	// Player update
	playerShip.y = PLAYER_Y; // Always keep Y fixed
	playerShip.update();
	// Enemies update
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
	}
	updateEnemies();
	// Player bullets update
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		b.update();
		// Remove if off screen
		if (b.y < -80) {
			b.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		for (var j = 0; j < enemies.length; j++) {
			var e = enemies[j];
			if (!e.alive) continue;
			if (checkCollision(b, e)) {
				// Enemy hit
				e.alive = false;
				e.visible = false;
				b.destroy();
				playerBullets.splice(i, 1);
				LK.setScore(LK.getScore() + 10 * e.type);
				scoreTxt.setText(LK.getScore());
				LK.getSound('explosion').play();
				break;
			}
		}
	}
	// Enemy bullets update
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var b = enemyBullets[i];
		b.update();
		if (b.y > GAME_HEIGHT + 80) {
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (checkCollision(b, playerShip)) {
			// Player hit
			b.destroy();
			enemyBullets.splice(i, 1);
			playerDeath();
			return;
		}
	}
	// Enemy dive collision with player removed (no diving enemies)
	// Check win condition
	var anyAlive = false;
	for (var i = 0; i < enemies.length; i++) {
		if (enemies[i].alive) {
			anyAlive = true;
			break;
		}
	}
	if (!anyAlive) {
		// Next wave
		wave++;
		waveTxt.setText('Wave ' + wave);
		// Remove old enemies
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].destroy();
		}
		enemies = [];
		enemyMoveTick = 0;
		enemyDiveTick = 0;
		spawnEnemies();
	}
};
// Player death
function playerDeath() {
	if (gameOver) return;
	gameOver = true;
	LK.effects.flashScreen(0xff0000, 1000);
	tween(playerShip, {
		alpha: 0
	}, {
		duration: 600,
		easing: tween.cubicOut
	});
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 900);
}
// Score
LK.setScore(0);
scoreTxt.setText(LK.getScore());
/* End of file */

===================================================================
--- original.js
+++ change.js
@@ -292,22 +292,8 @@
 // Game update
 game.update = function () {
 	if (gameOver) return;
 	// Player update
-	// Auto-move player ship left/right
-	if (!playerShip.autoDir) playerShip.autoDir = 1;
-	if (!playerShip.lastX) playerShip.lastX = playerShip.x;
-	var minX = playerShip.width / 2 + 100;
-	var maxX = GAME_WIDTH - playerShip.width / 2;
-	playerShip.x += playerShip.speed * playerShip.autoDir;
-	if (playerShip.x > maxX) {
-		playerShip.x = maxX;
-		playerShip.autoDir = -1;
-	}
-	if (playerShip.x < minX) {
-		playerShip.x = minX;
-		playerShip.autoDir = 1;
-	}
 	playerShip.y = PLAYER_Y; // Always keep Y fixed
 	playerShip.update();
 	// Enemies update
 	for (var i = 0; i < enemies.length; i++) {