Nice idea and it shows a lot of potential. The movement was really good, in that it didn't take away from the puzzles and the overall experience. I don't feel like it fits the limitation though, the rock may be immobile, but the limitation is "You are immobile," not "something is immobile."
Other than that, the puzzles felt easy and not really inspired, it didn't feel like they explored the mechanics a well as they should. In a vacuum though, it felt polished and well done in general, other than the puzzles being easy and the moving platforms not really adding difficulty, but making those parts more tedious and not very enjoyable.