Won't Restart

var Game = {

    preload : function() {
        game.stage.backgroundColor = '#71c5cf';

        game.load.spritesheet('bee', 'assets/images/sprites/bee-3-sprite.png', 58, 52, 2);
        game.load.image('pipe', 'assets/images/pipe.png');

        // Load the jump sound
        game.load.audio('jump', 'assets/images/jump.wav');
        game.load.audio('buzzing', 'assets/images/buzzing.wav');
    },

    create : function() {

        game.physics.startSystem(Phaser.Physics.ARCADE);

        this.pipes = game.add.group();
        this.pipes.enableBody = true;
        this.pipes.createMultiple(20, 'pipe');
        this.timer = this.game.time.events.loop(1500, this.addRowOfPipes, this);

        // Add Spritesheet, Animate Spritesheet, Add Physics
        this.bee = this.game.add.sprite(100, 245, 'bee');
        this.bee.animations.add('fly',[0,1]);
        this.bee.animations.play('fly', 20, true);
        game.physics.arcade.enable(this.bee);
        this.bee.body.gravity.y = 1000;

        // New anchor position
        this.bee.anchor.setTo(-0.2, 0.5);

        var spaceKey = this.game.input.keyboard.addKey(Phaser.Keyboard.SPACEBAR);
        spaceKey.onDown.add(this.jump, this);

        this.score = 0;
        this.labelScore = this.game.add.text(20, 20, "0", { font: "30px Arial", fill: "#ffffff" });

        // Add the jump sound
        this.jumpSound = this.game.add.audio('jump');

        // Add the buzzin sound
        music = game.add.audio('buzzing');

        music.play();

    },



    update: function() {
        if (this.bee.inWorld == false)
            this.restartGame();

        game.physics.arcade.overlap(this.bee, this.pipes, this.hitPipe, null, this);

        // Slowly rotate the bird downward, up to a certain point.
        if (this.bee.angle < 20)
            this.bee.angle += 1;
    },

    jump: function() {
        // If the bird is dead, he can't jump
        if (this.bee.alive == false)
            return;

        this.bee.body.velocity.y = -350;

        // Jump animation
        game.add.tween(this.bee).to({angle: -20}, 100).start();

        // Play sound
        this.jumpSound.play();
    },

    hitPipe: function() {
        // If the bird has already hit a pipe, we have nothing to do
        if (this.bee.alive == false)
            return;

        // Set the alive property of the bird to false
        this.bee.alive = false;

        // Prevent new pipes from appearing
        this.game.time.events.remove(this.timer);

        // Go through all the pipes, and stop their movement
        this.pipes.forEachAlive(function(p){
            p.body.velocity.x = 0;
        }, this);
    },

    restartGame: function() {
        game.state.start('main');
    },

    addOnePipe: function(x, y) {
        var pipe = this.pipes.getFirstDead();

        pipe.reset(x, y);
        pipe.body.velocity.x = -200;
        pipe.checkWorldBounds = true;
        pipe.outOfBoundsKill = true;
    },

    addRowOfPipes: function() {
        var hole = Math.floor(Math.random()*5)+1;

        for (var i = 0; i < 8; i++)
            if (i != hole && i != hole +1)
                this.addOnePipe(400, i*60+10);

        this.score += 1;
        this.labelScore.text = this.score;
    },

};

game.state.add('main', mainState);
game.state.start('main');