A very challenging game I would say. Like trying to make this floaty slimy head navigate around the level is one challenge, and not getting dizzy from the rotating level is another =D. I think it would be less headache inducing if the background stayed still and only the other objects rotated. Another thing that I feel would help is having some kind of health/allowing the slimy head to take one or two extra hits before dying and restarting the level. I like your (controlling the level not the player) interpretation of the limitation though it is very neat. The whole concept is awesome but I am just really bad at this type of game.
Cool challenging game overall. Very good stuff.