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

/**** 
* Classes
****/ 
// Obstacle class (tree or rock)
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	self.type = Math.random() < 0.6 ? 'tree' : 'rock';
	var assetId = self.type === 'tree' ? 'tree' : 'rock';
	var obs = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = obs.width * 0.45;
	self.speed = 0; // Set by game
	return self;
});
// Powerup class (shield or boost)
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	self.kind = Math.random() < 0.5 ? 'shield' : 'boost';
	var assetId = self.kind === 'shield' ? 'shield' : 'boost';
	var pu = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = pu.width * 0.45;
	self.speed = 0; // Set by game
	return self;
});
// Snowboarder (player) class
var Snowboarder = Container.expand(function () {
	var self = Container.call(this);
	var sb = self.attachAsset('snowboarder', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = sb.width * 0.45; // For collision
	self.hasShield = false;
	self.shieldNode = null;
	// Show shield visual if active
	self.setShield = function (active) {
		self.hasShield = active;
		if (active && !self.shieldNode) {
			self.shieldNode = self.attachAsset('shield', {
				anchorX: 0.5,
				anchorY: 0.5,
				scaleX: 1.3,
				scaleY: 1.3,
				alpha: 0.5
			});
		} else if (!active && self.shieldNode) {
			self.shieldNode.destroy();
			self.shieldNode = null;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xffffff // White for snow
});

/**** 
* Game Code
****/ 
// Speed boost powerup
// Shield powerup
// Rock obstacle
// Tree obstacle
// Snowboarder (player)
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var PLAY_AREA_MARGIN = 120; // px, left/right margin for obstacles
var OBSTACLE_MIN_Y_DIST = 400; // Minimum vertical distance between obstacles
var OBSTACLE_MAX_Y_DIST = 700;
var OBSTACLE_MIN_X = PLAY_AREA_MARGIN;
var OBSTACLE_MAX_X = GAME_WIDTH - PLAY_AREA_MARGIN;
var POWERUP_CHANCE = 0.12; // Chance to spawn a powerup instead of obstacle
// Game state
var snowboarder;
var obstacles = [];
var powerups = [];
var dragNode = null;
var dragOffsetX = 0;
var dragStartX = 0;
var dragStartSnowboarderX = 0;
var lastObstacleY = 0;
var speed = 18; // Initial speed (pixels per frame)
var maxSpeed = 48;
var speedIncreaseEvery = 600; // Increase speed every N ticks
var ticksSinceStart = 0;
var distance = 0; // Distance traveled (score)
var scoreTxt;
var shieldTimer = 0;
var boostTimer = 0;
var isBoosting = false;
// GUI: Score
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#222"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Initialize player
snowboarder = new Snowboarder();
game.addChild(snowboarder);
snowboarder.x = GAME_WIDTH / 2;
snowboarder.y = GAME_HEIGHT * 0.12;
// Helper: Clamp value
function clamp(val, min, max) {
	return Math.max(min, Math.min(max, val));
}
// Helper: Distance between two objects
function dist(a, b) {
	var dx = a.x - b.x;
	var dy = a.y - b.y;
	return Math.sqrt(dx * dx + dy * dy);
}
// Spawn an obstacle or powerup
function spawnObstacleOrPowerup(y) {
	if (Math.random() < POWERUP_CHANCE) {
		// Powerup
		var pu = new Powerup();
		pu.x = Math.random() * (OBSTACLE_MAX_X - OBSTACLE_MIN_X) + OBSTACLE_MIN_X;
		pu.y = y;
		pu.speed = speed;
		powerups.push(pu);
		game.addChild(pu);
	} else {
		// Obstacle
		var obs = new Obstacle();
		obs.x = Math.random() * (OBSTACLE_MAX_X - OBSTACLE_MIN_X) + OBSTACLE_MIN_X;
		obs.y = y;
		obs.speed = speed;
		obstacles.push(obs);
		game.addChild(obs);
	}
}
// Initial obstacles
lastObstacleY = snowboarder.y - 600;
for (var i = 0; i < 6; i++) {
	lastObstacleY -= Math.random() * (OBSTACLE_MAX_Y_DIST - OBSTACLE_MIN_Y_DIST) + OBSTACLE_MIN_Y_DIST;
	spawnObstacleOrPowerup(lastObstacleY);
}
// Touch/drag controls
game.down = function (x, y, obj) {
	// Only allow drag if touch is on lower 2/3 of screen (to avoid top menu)
	if (y > GAME_HEIGHT * 0.2) {
		dragNode = snowboarder;
		dragStartX = x;
		dragStartSnowboarderX = snowboarder.x;
	}
};
game.move = function (x, y, obj) {
	if (dragNode === snowboarder) {
		var dx = x - dragStartX;
		var newX = clamp(dragStartSnowboarderX + dx, OBSTACLE_MIN_X, OBSTACLE_MAX_X);
		snowboarder.x = newX;
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main game loop
game.update = function () {
	ticksSinceStart++;
	// Increase speed over time
	if (ticksSinceStart % speedIncreaseEvery === 0 && speed < maxSpeed) {
		speed += 2;
	}
	// If boosting, increase speed temporarily
	var currentSpeed = isBoosting ? speed * 1.7 : speed;
	// Move obstacles and powerups up (reverse flow)
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.y -= currentSpeed;
		obs.speed = currentSpeed;
		// Remove if off screen (now above screen)
		if (obs.y + obs.height / 2 < -100) {
			obs.destroy();
			obstacles.splice(i, 1);
		}
	}
	for (var i = powerups.length - 1; i >= 0; i--) {
		var pu = powerups[i];
		pu.y -= currentSpeed;
		pu.speed = currentSpeed;
		// Remove if off screen (now above screen)
		if (pu.y + pu.height / 2 < -100) {
			pu.destroy();
			powerups.splice(i, 1);
		}
	}
	// Spawn new obstacles/powerups as needed (now below player)
	while (lastObstacleY < snowboarder.y + 3000) {
		lastObstacleY += Math.random() * (OBSTACLE_MAX_Y_DIST - OBSTACLE_MIN_Y_DIST) + OBSTACLE_MIN_Y_DIST;
		spawnObstacleOrPowerup(lastObstacleY);
	}
	// Collision: obstacles
	var collided = false;
	for (var i = 0; i < obstacles.length; i++) {
		var obs = obstacles[i];
		if (dist(snowboarder, obs) < snowboarder.radius + obs.radius) {
			collided = true;
			break;
		}
	}
	if (collided) {
		if (snowboarder.hasShield) {
			snowboarder.setShield(false);
			// Flash snowboarder
			LK.effects.flashObject(snowboarder, 0xffe066, 600);
		} else {
			// Game over
			LK.effects.flashScreen(0xff0000, 900);
			LK.showGameOver();
			return;
		}
	}
	// Collision: powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var pu = powerups[i];
		if (dist(snowboarder, pu) < snowboarder.radius + pu.radius) {
			if (pu.kind === 'shield') {
				snowboarder.setShield(true);
				shieldTimer = 360; // 6 seconds at 60fps
			} else if (pu.kind === 'boost') {
				isBoosting = true;
				boostTimer = 180; // 3 seconds at 60fps
				// Flash snowboarder red for boost
				LK.effects.flashObject(snowboarder, 0xff3b3b, 400);
			}
			pu.destroy();
			powerups.splice(i, 1);
		}
	}
	// Powerup timers
	if (snowboarder.hasShield) {
		shieldTimer--;
		if (shieldTimer <= 0) {
			snowboarder.setShield(false);
		}
	}
	if (isBoosting) {
		boostTimer--;
		if (boostTimer <= 0) {
			isBoosting = false;
		}
	}
	// Move snowboarder down the screen (reverse flow)
	snowboarder.y += currentSpeed;
	// Score: distance traveled
	distance += currentSpeed;
	var scoreVal = Math.floor(distance / 10);
	LK.setScore(scoreVal);
	scoreTxt.setText(scoreVal);
	// Win condition: none (endless), but you could add a win at e.g. 10000m
};
/* End of game code */

===================================================================
--- original.js
+++ change.js
@@ -113,9 +113,9 @@
 // Initialize player
 snowboarder = new Snowboarder();
 game.addChild(snowboarder);
 snowboarder.x = GAME_WIDTH / 2;
-snowboarder.y = GAME_HEIGHT * 0.75;
+snowboarder.y = GAME_HEIGHT * 0.12;
 // Helper: Clamp value
 function clamp(val, min, max) {
 	return Math.max(min, Math.min(max, val));
 }