Really like your idea of the level swapping and the platforming movement feels good. Game is fun albeit a bit hard. Well done! I think with a bit more polish and time you could really expand on this concept.
I really hope you enjoyed the game. I was actually planning in adding more difficulites so you can play it in easy or normal mode (both of them would have been easier than the current setup), but i ran out of time and couldnt finish it.