enchant.js issues?

gistfile1.js

window.onload = function() {
  enchant();

  var game = new Game(640, 960);
  game.fps = 60;
  game.preload('bg.jpg');
  game.preload('chara1.png');
  game.onload = function () {
    var bg = new Sprite(640, 960);
    bg.image = game.assets['bg.jpg'];
    game.rootScene.addChild(bg);

    var canvasGroup = new CanvasGroup();
    //game.rootScene.addChild(canvasGroup);

    var addBear = function () {
      var bear = new Sprite(32, 32);
      bear.image = game.assets['chara1.png'];
      bear.animeWaitMax = 3;
      bear.animeWaitCount = 0;
      bear.addEventListener('enterframe', function(evt) {
        if (this.animeWaitCount >= this.animeWaitMax) {
          this.animeWaitCount = 0;
          if (bear.frame > 2) {
            bear.frame = 0;
          } else {
            bear.frame++;
          }
        } else {
          this.animeWaitCount++;
        }
      });
      //canvasGroup.addChild(bear);
      game.rootScene.addChild(bear);
      return bear;
    };

    game.rootScene.addEventListener('touchend', function(evt){
      var bear = addBear();
      //bear.tl.moveTo(100, 200, 30);
      bear.tl.rotateBy(360, 30).and().moveTo(100, 100, 30, enchant.Easing.LINEAR);
    });
  };
  game.start();
};