omg, really outstanding game idea. love it. the difficulty is just exactly right for me, a tiny bit harder and i wouldn`t have finished level 5, 6, 7. The moving platforms add a whole new element to the game. Might be a good idea to put in a fullscreen button here? I had to zoom in in chrome with the mousewheel to get a decent big image.
With some music and a tiny amout of maybe shadows or something and a few more levels i could imagine this to be a really cool game!
I would make it so that you can only finish the level / enter the door, if the door is visible. I did just rush through level 8 without any technique, just speed.
Well done especially in this short amount of time