/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15 - Math.floor(LK.getScore() / 10);
	self.update = function () {
		self.y += self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5 + Math.floor(LK.getScore() / 10);
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
		}
	};
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// Hero update logic
	};
});
// Character class
var Karakter = Container.expand(function () {
	var self = Container.call(this);
	var karakterGraphics = self.attachAsset('karakter', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// Character update logic
	};
});

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

/**** 
* Game Code
****/ 
var karakter = game.addChild(new Karakter());
karakter.x = 2048 / 2;
karakter.y = 2500;
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2500;
var enemies = [];
var bullets = [];
var score = 0;
function spawnEnemy() {
	var enemy = new Enemy();
	enemy.x = Math.random() * 2048;
	enemy.y = 0;
	enemies.push(enemy);
	game.addChild(enemy);
}
function shootBullet() {
	var bullet = new Bullet();
	bullet.x = hero.x;
	bullet.y = hero.y;
	bullets.push(bullet);
	game.addChild(bullet);
}
game.down = function (x, y, obj) {
	hero.x = x;
	hero.y = y;
	karakter.x = x;
	karakter.y = y;
};
game.update = function () {
	if (LK.ticks % Math.max(5, 30 - Math.floor(LK.getScore() / 10)) === 0) {
		spawnEnemy();
	}
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].update();
		if (enemies[i].intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	for (var j = bullets.length - 1; j >= 0; j--) {
		bullets[j].update();
		for (var k = enemies.length - 1; k >= 0; k--) {
			if (bullets[j].intersects(enemies[k])) {
				score += 1;
				bullets[j].destroy();
				enemies[k].destroy();
				bullets.splice(j, 1);
				enemies.splice(k, 1);
				break;
			}
		}
	}
	if (LK.ticks % 30 === 0) {
		shootBullet();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -97,9 +97,9 @@
 	karakter.x = x;
 	karakter.y = y;
 };
 game.update = function () {
-	if (LK.ticks % Math.max(10, 60 - Math.floor(LK.getScore() / 10)) === 0) {
+	if (LK.ticks % Math.max(5, 30 - Math.floor(LK.getScore() / 10)) === 0) {
 		spawnEnemy();
 	}
 	for (var i = enemies.length - 1; i >= 0; i--) {
 		enemies[i].update();