If the wall doesn't have the bright stuff it doesn't have any friction and you can't use it to move because of this if you have any movement you keep the movement which causes you to move pretty slow sometimes. I didn't really tell the user in anyways how it worked though so it definitely needs work XD.
The audio works when I play it, but a couple of people said it wasn't working for them. Mind if I ask what browser you're using so I can prevent this problem in the future?