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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach bird asset (yellow ellipse)
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Physics properties
	self.vy = 0; // vertical velocity
	self.gravity = 1.1; // gravity per frame (bird falls faster)
	self.flapStrength = -22; // weaker flap, harder to lift
	// Bird size for collision
	self.radius = birdAsset.width * 0.45;
	// Flap method
	self.flap = function () {
		self.vy = self.flapStrength;
	};
	// Update method (called every tick)
	self.update = function () {
		self.vy += self.gravity;
		self.y += self.vy;
		// Clamp rotation for visual feedback
		var maxAngle = Math.PI / 4;
		var minAngle = -Math.PI / 3;
		var targetAngle = Math.max(minAngle, Math.min(maxAngle, self.vy / 40));
		birdAsset.rotation = targetAngle;
	};
	return self;
});
// PipePair class (top and bottom pipes)
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe gap and width
	self.gap = 480;
	self.pipeWidth = 220;
	// Randomize gap position
	var minY = 180;
	var maxY = 2732 - 180 - self.gap;
	self.gapY = minY + Math.floor(Math.random() * (maxY - minY + 1));
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 1,
		x: 0,
		y: self.gapY,
		height: self.gapY,
		width: self.pipeWidth,
		tint: 0x4ec04e
	});
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 0,
		x: 0,
		y: self.gapY + self.gap,
		height: 2732 - (self.gapY + self.gap),
		width: self.pipeWidth,
		tint: 0x4ec04e
	});
	// For collision
	self.topPipe = topPipe;
	self.bottomPipe = bottomPipe;
	// Has the bird passed this pipe? (for scoring)
	self.passed = false;
	// Update method
	self.update = function () {
		self.x -= pipesSpeed;
	};
	// Destroy method
	self.destroyPair = function () {
		self.destroy();
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// Game constants
var BIRD_START_X = 600;
var BIRD_START_Y = 1366;
var GROUND_HEIGHT = 220;
var PIPE_INTERVAL = 140; // frames between pipes (less frequent)
var pipesSpeed = 9;
// Asset initialization
// Score text
var scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Bird
var bird = new Bird();
game.addChild(bird);
bird.x = BIRD_START_X;
bird.y = BIRD_START_Y;
// Ground
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2732 - GROUND_HEIGHT
});
game.addChild(ground);
// Pipes array
var pipes = [];
// Game state
var isAlive = true;
var frameCount = 0;
var dragNode = null;
// Reset function (called on game start and after game over)
function resetGame() {
	// Remove pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		pipes[i].destroyPair();
		pipes.splice(i, 1);
	}
	// Reset bird
	bird.x = BIRD_START_X;
	bird.y = BIRD_START_Y;
	bird.vy = 0;
	// Reset score
	LK.setScore(0);
	scoreTxt.setText('0');
	// Reset state
	isAlive = true;
	frameCount = 0;
}
// Collision detection (circle-rectangle)
function circleRectCollide(cx, cy, radius, rx, ry, rw, rh) {
	// Find closest point to circle within rectangle
	var closestX = Math.max(rx, Math.min(cx, rx + rw));
	var closestY = Math.max(ry, Math.min(cy, ry + rh));
	var dx = cx - closestX;
	var dy = cy - closestY;
	return dx * dx + dy * dy < radius * radius;
}
// Main update loop
game.update = function () {
	if (!isAlive) return;
	bird.update();
	// Pipes logic
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pair = pipes[i];
		pair.update();
		// Remove pipes off screen
		if (pair.x + pair.pipeWidth < 0) {
			pair.destroyPair();
			pipes.splice(i, 1);
			continue;
		}
		// Score: if bird passes pipe
		if (!pair.passed && bird.x > pair.x + pair.pipeWidth) {
			pair.passed = true;
			var newScore = LK.getScore() + 1;
			LK.setScore(newScore);
			scoreTxt.setText(newScore + '');
		}
		// Collision with pipes
		// Top pipe
		if (circleRectCollide(bird.x, bird.y, bird.radius, pair.x, 0, pair.pipeWidth, pair.gapY)) {
			gameOver();
			return;
		}
		// Bottom pipe
		if (circleRectCollide(bird.x, bird.y, bird.radius, pair.x, pair.gapY + pair.gap, pair.pipeWidth, 2732 - (pair.gapY + pair.gap))) {
			gameOver();
			return;
		}
	}
	// Collision with ground
	if (bird.y + bird.radius > 2732 - GROUND_HEIGHT) {
		bird.y = 2732 - GROUND_HEIGHT - bird.radius;
		gameOver();
		return;
	}
	// Collision with ceiling
	if (bird.y - bird.radius < 0) {
		bird.y = bird.radius;
		bird.vy = 0;
	}
	// Pipe spawn
	frameCount++;
	if (frameCount % PIPE_INTERVAL === 0) {
		var pipePair = new PipePair();
		pipePair.x = 2048;
		game.addChild(pipePair);
		pipes.push(pipePair);
	}
};
// Game over logic
function gameOver() {
	isAlive = false;
	LK.effects.flashScreen(0xff0000, 600);
	LK.showGameOver();
}
// Tap/Touch to flap
game.down = function (x, y, obj) {
	if (!isAlive) return;
	bird.flap();
};
// Dragging is not used, but required for mobile compatibility
game.move = function (x, y, obj) {};
// Reset game on game over (handled by LK, but for clarity)
game.on('reset', function () {
	resetGame();
});
// Initial reset
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -15,10 +15,10 @@
 		anchorY: 0.5
 	});
 	// Physics properties
 	self.vy = 0; // vertical velocity
-	self.gravity = 0.7; // gravity per frame (even slower fall)
-	self.flapStrength = -32; // stronger flap for easier control
+	self.gravity = 1.1; // gravity per frame (bird falls faster)
+	self.flapStrength = -22; // weaker flap, harder to lift
 	// Bird size for collision
 	self.radius = birdAsset.width * 0.45;
 	// Flap method
 	self.flap = function () {