I like the black/white minimalist design, as well as the retro style sound effects. Not really being able to change directions in mid-air made jumping around a bit difficult, and I ultimately got stuck on a level where I couldn't switch realities and I couldn't find a way out. I think your concept has a lot of potential for interesting levels, it's just a little bit on the difficult side right now. Overall, though, I definitely had fun.
If you have time I would really appreciate if you could rate my game as well, although I understand if aren't able.