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

/**** 
* Classes
****/ 
var Debris = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('debris', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 6;
	self.lastY = undefined;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Meteorite = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('meteorite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.lastY = undefined;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Spaceship = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('spaceship', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
var TouchSlider = Container.expand(function () {
	var self = Container.call(this);
	var sliderBar = self.attachAsset('sliderBar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var sliderHandle = self.addChild(LK.getAsset('sliderHandle', {
		anchorX: 0.5,
		anchorY: 0.5
	}));
	self.minX = -180;
	self.maxX = 180;
	self.isDragging = false;
	self.down = function (x, y, obj) {
		self.isDragging = true;
		self.updateHandle(x);
	};
	self.up = function (x, y, obj) {
		self.isDragging = false;
	};
	self.updateHandle = function (x) {
		var localX = x - self.x;
		localX = Math.max(self.minX, Math.min(self.maxX, localX));
		sliderHandle.x = localX;
	};
	self.getSliderValue = function () {
		return sliderHandle.x / 180;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000011
});

/**** 
* Game Code
****/ 
var spaceship = game.addChild(new Spaceship());
spaceship.x = 2048 / 2;
spaceship.y = 2000;
var obstacles = [];
var obstacleSpawnTimer = 0;
var obstacleSpawnRate = 90;
var gameSpeed = 1;
var spaceshipSpeed = 1;
var survivalTime = 0;
var difficultyTimer = 0;
var lastScoreCheck = 0;
var slider = game.addChild(new TouchSlider());
slider.x = 2048 / 2;
slider.y = 2600;
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var timeTxt = new Text2('Time: 0s', {
	size: 60,
	fill: 0xFFFFFF
});
timeTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(timeTxt);
timeTxt.x = -20;
timeTxt.y = 100;
game.move = function (x, y, obj) {
	if (slider.isDragging) {
		slider.updateHandle(x);
		var sliderValue = slider.getSliderValue();
		spaceship.x = 2048 / 2 + sliderValue * 800 * spaceshipSpeed;
		spaceship.x = Math.max(100, Math.min(1948, spaceship.x));
	}
};
game.update = function () {
	survivalTime++;
	difficultyTimer++;
	if (survivalTime % 60 === 0) {
		var seconds = Math.floor(survivalTime / 60);
		timeTxt.setText('Time: ' + seconds + 's');
	}
	// Every 15 seconds (900 ticks), increase obstacle speed by 5%
	if (difficultyTimer >= 900) {
		difficultyTimer = 0;
		gameSpeed *= 1.05;
		obstacleSpawnRate = Math.max(30, obstacleSpawnRate - 5);
	}
	// Every 50 points, increase spaceship speed slightly
	var currentScore = LK.getScore();
	if (Math.floor(currentScore / 50) > Math.floor(lastScoreCheck / 50)) {
		spaceshipSpeed += 0.1;
	}
	lastScoreCheck = currentScore;
	obstacleSpawnTimer++;
	if (obstacleSpawnTimer >= obstacleSpawnRate) {
		obstacleSpawnTimer = 0;
		var obstacle;
		if (Math.random() < 0.7) {
			obstacle = new Meteorite();
		} else {
			obstacle = new Debris();
		}
		obstacle.x = Math.random() * 1800 + 124;
		obstacle.y = -100;
		obstacle.speed *= gameSpeed;
		obstacle.lastY = obstacle.y;
		obstacles.push(obstacle);
		game.addChild(obstacle);
	}
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		if (obstacle.lastY < 2800 && obstacle.y >= 2800) {
			LK.setScore(LK.getScore() + 10);
			scoreTxt.setText(LK.getScore());
		}
		if (obstacle.y > 2800) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		if (spaceship.intersects(obstacle)) {
			LK.getSound('destroy').play();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
		obstacle.lastY = obstacle.y;
	}
};

===================================================================
--- original.js
+++ change.js
@@ -82,15 +82,17 @@
 * Game Code
 ****/ 
 var spaceship = game.addChild(new Spaceship());
 spaceship.x = 2048 / 2;
-spaceship.y = 2300;
+spaceship.y = 2000;
 var obstacles = [];
 var obstacleSpawnTimer = 0;
 var obstacleSpawnRate = 90;
 var gameSpeed = 1;
+var spaceshipSpeed = 1;
 var survivalTime = 0;
 var difficultyTimer = 0;
+var lastScoreCheck = 0;
 var slider = game.addChild(new TouchSlider());
 slider.x = 2048 / 2;
 slider.y = 2600;
 var scoreTxt = new Text2('0', {
@@ -110,9 +112,9 @@
 game.move = function (x, y, obj) {
 	if (slider.isDragging) {
 		slider.updateHandle(x);
 		var sliderValue = slider.getSliderValue();
-		spaceship.x = 2048 / 2 + sliderValue * 800;
+		spaceship.x = 2048 / 2 + sliderValue * 800 * spaceshipSpeed;
 		spaceship.x = Math.max(100, Math.min(1948, spaceship.x));
 	}
 };
 game.update = function () {
@@ -121,13 +123,20 @@
 	if (survivalTime % 60 === 0) {
 		var seconds = Math.floor(survivalTime / 60);
 		timeTxt.setText('Time: ' + seconds + 's');
 	}
-	if (difficultyTimer >= 600) {
+	// Every 15 seconds (900 ticks), increase obstacle speed by 5%
+	if (difficultyTimer >= 900) {
 		difficultyTimer = 0;
+		gameSpeed *= 1.05;
 		obstacleSpawnRate = Math.max(30, obstacleSpawnRate - 5);
-		gameSpeed = Math.min(2, gameSpeed + 0.1);
 	}
+	// Every 50 points, increase spaceship speed slightly
+	var currentScore = LK.getScore();
+	if (Math.floor(currentScore / 50) > Math.floor(lastScoreCheck / 50)) {
+		spaceshipSpeed += 0.1;
+	}
+	lastScoreCheck = currentScore;
 	obstacleSpawnTimer++;
 	if (obstacleSpawnTimer >= obstacleSpawnRate) {
 		obstacleSpawnTimer = 0;
 		var obstacle;