//Always include this, it helps AI's
//@include('ai-support.js')
XS.stageContainer.setBackgroundColor(0x008080);

function game() {
    /** Entity Classes **/
    var Bird = Container.expand(function() {
        var self = Container.call(this); //{0}
        var birdGraphics = XS.getAsset('bird', 'Flappy Bird');
        birdGraphics.anchor.set(0.5, 0.5);
        self.addChild(birdGraphics);

        self.velocity = 0; //{1}
        self.gravity = 0.5;
        self.lift = -15;

        self.update = function() { //{2}
            self.velocity += self.gravity;
            self.y += self.velocity;

            if (self.y < 0) {
                self.y = 0;
                self.velocity = 0; //{3}
            } //{4}

            self.rotation = Math.atan(self.velocity / 10);
        }; //{5}

        self.flap = function() {
            self.velocity += self.lift;
        }; //{6}
    }); //{7}

    var Pipe = Container.expand(function() {
        var self = Container.call(this); //{8}
        self.passed = false;
        var topPipeGraphics = XS.getAsset('pipe', 'Top Pipe Graphics');
        topPipeGraphics.anchor.set(0.5, 1);
        self.addChild(topPipeGraphics);

        var bottomPipeGraphics = XS.getAsset('pipe', 'Bottom Pipe Graphics');
        bottomPipeGraphics.anchor.set(0.5, 0);
        self.addChild(bottomPipeGraphics);

        self.setGap = function(gapSize, gapPosition) {
            topPipeGraphics.y = gapPosition - gapSize / 2;
            bottomPipeGraphics.y = gapPosition + gapSize / 2;
        }; //{9}

        self.speed = -10;

        self.update = function() { //{10}
            self.x += self.speed; //{11}
        }; //{12}
    }); //{13}

    /** Main Class **/
    var Ground = Container.expand(function() {
        var self = Container.call(this); //{14}
        var groundGraphics = XS.getAsset('ground', 'Ground Graphics');
        groundGraphics.anchor.set(0, 0);
        self.addChild(groundGraphics);

        self.speed = -2;

        self.update = function() { //{15}
            self.x += self.speed; //{16}
            if (self.x <= -self.width / 2) {
                self.x = 0;
            } //{17}
        }; //{18}
    }); //{19}

    var FlappyFRVR = Container.expand(function() {
        var self = Container.call(this); //{20}

        var bird = self.addChild(new Bird());
        bird.x = 2048 / 4;
        bird.y = 2732 / 2; //{21}

        var ground = self.addChild(new Ground());
        ground.y = 2732;

        var pipes = [];

        function spawnPipe() {
            var pipe = new Pipe();
            pipe.x = stage.width;
            var gapPosition = Math.random() * (2732 - 400) + 200;
            pipe.setGap(1200, gapPosition);
            pipes.push(pipe);
            self.addChildAt(pipe, 0);
        } //{22}

        function updatePipes() {
            for (var i = 0; i < pipes.length; i++) { //{23}
                pipes[i].update();
                pipes[i].speed = -10 - score * 0.5;

                if (pipes[i].x < -stage.width) {
                    self.removeChild(pipes[i]); //{24}
                    pipes.splice(i, 1);
                    i--;
                } //{25}
            } //{26}
        } //{27}

        function checkCollision() {
            for (var i = 0; i < pipes.length; i++) { //{28}
                if (bird.intersects(pipes[i])) {
                    return true;
                } //{29}
            } //{30}
            return false;
        } //{31}

        function restartGame() {
            bird.y = 2732 / 2; //{32}
            bird.velocity = 0;

            for (var i = 0; i < pipes.length; i++) { //{33}
                self.removeChild(pipes[i]); //{34}
            } //{35}
            pipes = [];
            score = 0;
            scoreText.setText(score); //{36}
        } //{37}

        var spawnPipeInterval = XS.setInterval(spawnPipe, 2000);

        var score = 0;
        var scoreText = new Text2('0', {
            size: 150,
            font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
            fill: "#ffffff"
        }); //{38}
        scoreText.anchor.set(0.5, 0);
        XS.gui.top.addChild(scoreText);

        XS.on('tick', function() {
            bird.update();
            ground.update();
            updatePipes();

            if (checkCollision() || bird.y + bird.height / 2 >= ground.y) {
                XS.showGameOver(restartGame);
            } else {
                for (var i = 0; i < pipes.length; i++) { //{39}
                    if (pipes[i].x + pipes[i].width / 2 < bird.x && !pipes[i].passed) {
                        pipes[i].passed = true;
                        score++;
                        scoreText.setText(score); //{40}
                    } //{41}
                } //{42}
            } //{43}
        }); //{44}

        stage.on('down', function() {
            bird.flap();
        }); //{45}
    }); //{46}

    /** Initialize the 'main class' and attach it to stage **/
    var flappyFRVR = new FlappyFRVR();
    stage.addChild(flappyFRVR);

    function positionElements() {
        flappyFRVR.x = (stage.width - 2048) / 2;
    } //{47}
    positionElements();
    XS.on('resize', positionElements);
} //{48}

===================================================================
--- original.js
+++ change.js
@@ -21,8 +21,10 @@
             if (self.y < 0) {
                 self.y = 0;
                 self.velocity = 0; //{3}
             } //{4}
+
+            self.rotation = Math.atan(self.velocity / 10);
         }; //{5}
 
         self.flap = function() {
             self.velocity += self.lift;