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

/**** 
* Classes
****/ 
var EnemySubmarine = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemySubmarine', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.points = 10;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var SeaCreature = Container.expand(function () {
	var self = Container.call(this);
	var creatureGraphics = self.attachAsset('seaCreature', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.points = 20;
	self.update = function () {
		self.y += self.speed;
		// Add slight horizontal movement for more dynamic behavior
		self.x += Math.sin(LK.ticks * 0.05) * 0.5;
	};
	return self;
});
var SeaMine = Container.expand(function () {
	var self = Container.call(this);
	var mineGraphics = self.attachAsset('seaMine', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.points = 15;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Submarine = Container.expand(function () {
	var self = Container.call(this);
	var submarineGraphics = self.attachAsset('submarine', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
var Torpedo = Container.expand(function () {
	var self = Container.call(this);
	var torpedoGraphics = self.attachAsset('torpedo', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -8;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000080
});

/**** 
* Game Code
****/ 
// Game variables
var submarine;
var torpedoes = [];
var enemies = [];
var dragNode = null;
var spawnTimer = 0;
var difficultyLevel = 1;
var enemySpawnRate = 120; // Initial spawn rate (ticks between spawns)
// Create submarine
submarine = game.addChild(new Submarine());
submarine.x = 2048 / 2;
submarine.y = 2732 - 200;
// Create score display
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.setText(LK.getScore());
// Create high score display
var highScore = storage.highScore || 0;
var highScoreTxt = new Text2('Best: ' + highScore, {
	size: 60,
	fill: 0xFFFF00
});
highScoreTxt.anchor.set(1, 0);
highScoreTxt.y = 120;
LK.gui.topRight.addChild(highScoreTxt);
// Handle submarine movement
function handleMove(x, y, obj) {
	if (dragNode) {
		dragNode.x = Math.max(60, Math.min(2048 - 60, x));
		dragNode.y = Math.max(100, Math.min(2732 - 100, y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	dragNode = submarine;
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Spawn enemy function
function spawnEnemy() {
	var enemyType = Math.random();
	var enemy;
	if (enemyType < 0.5) {
		enemy = new EnemySubmarine();
	} else if (enemyType < 0.8) {
		enemy = new SeaMine();
	} else {
		enemy = new SeaCreature();
	}
	enemy.x = Math.random() * (2048 - 100) + 50;
	enemy.y = -50;
	enemy.lastY = enemy.y;
	enemy.lastIntersecting = false;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Main game update loop
game.update = function () {
	spawnTimer++;
	// Spawn enemies based on difficulty
	if (spawnTimer >= enemySpawnRate) {
		spawnEnemy();
		spawnTimer = 0;
		// Increase difficulty over time
		if (LK.ticks % 1800 == 0) {
			// Every 30 seconds
			difficultyLevel++;
			enemySpawnRate = Math.max(30, enemySpawnRate - 10);
		}
	}
	// Fire torpedoes automatically
	if (LK.ticks % 40 == 0) {
		var torpedo = new Torpedo();
		torpedo.x = submarine.x;
		torpedo.y = submarine.y - 40;
		torpedo.lastY = torpedo.y;
		torpedo.lastIntersecting = false;
		torpedoes.push(torpedo);
		game.addChild(torpedo);
		LK.getSound('torpedo_fire').play();
	}
	// Update and check torpedoes
	for (var t = torpedoes.length - 1; t >= 0; t--) {
		var torpedo = torpedoes[t];
		// Remove torpedoes that go off-screen
		if (torpedo.lastY >= -50 && torpedo.y < -50) {
			torpedo.destroy();
			torpedoes.splice(t, 1);
			continue;
		}
		// Check torpedo-enemy collisions
		var torpedoHit = false;
		for (var e = enemies.length - 1; e >= 0; e--) {
			var enemy = enemies[e];
			var currentIntersecting = torpedo.intersects(enemy);
			if (!torpedo.lastIntersecting && currentIntersecting) {
				// Torpedo hit enemy
				LK.setScore(LK.getScore() + enemy.points);
				scoreTxt.setText(LK.getScore());
				// Create explosion effect
				LK.effects.flashObject(enemy, 0xFFFFFF, 500);
				LK.getSound('explosion').play();
				// Remove both torpedo and enemy
				torpedo.destroy();
				torpedoes.splice(t, 1);
				enemy.destroy();
				enemies.splice(e, 1);
				torpedoHit = true;
				break;
			}
		}
		if (!torpedoHit) {
			torpedo.lastY = torpedo.y;
			torpedo.lastIntersecting = false;
		}
	}
	// Update and check enemies
	for (var e = enemies.length - 1; e >= 0; e--) {
		var enemy = enemies[e];
		// Remove enemies that go off-screen
		if (enemy.lastY <= 2732 + 50 && enemy.y > 2732 + 50) {
			enemy.destroy();
			enemies.splice(e, 1);
			continue;
		}
		// Check submarine-enemy collision
		var currentIntersecting = submarine.intersects(enemy);
		if (!enemy.lastIntersecting && currentIntersecting) {
			// Game Over
			LK.effects.flashScreen(0xFF0000, 1000);
			// Update high score
			if (LK.getScore() > highScore) {
				storage.highScore = LK.getScore();
			}
			LK.showGameOver();
			return;
		}
		enemy.lastY = enemy.y;
		enemy.lastIntersecting = currentIntersecting;
	}
};
// Start background music
LK.playMusic('underwater_ambient');

===================================================================
--- original.js
+++ change.js
@@ -155,9 +155,9 @@
 			enemySpawnRate = Math.max(30, enemySpawnRate - 10);
 		}
 	}
 	// Fire torpedoes automatically
-	if (LK.ticks % 20 == 0) {
+	if (LK.ticks % 40 == 0) {
 		var torpedo = new Torpedo();
 		torpedo.x = submarine.x;
 		torpedo.y = submarine.y - 40;
 		torpedo.lastY = torpedo.y;