As others have said, incredibly loud noise at the start is literal violence to the ears (and the listener). This is worsened by the fact that there seems to be no way of retrying other than F5/reloading page and having that sound play again and again each time. Other than that, couldn't figure out how to climb the floating island and death kept killing me no matter where I went or what I did. Jumping against the wall also would stick me on it (which meant death would gain more ground), also score would stay the same no matter what (11 and 41). After about 10 or so retries I gave up. Neat effect for the player moving!