Cool concept for a puzzle game. I haven't read, that you need to press Z to start the level at first so I though the game crashed... You might want to write that somewhere in the game as well. (Or just get rid of this button prompt.) But it all worked out in the end.
I think the puzzle design is pretty neat, however some of the levels are very frustrating because you have to wait for a blob of darkness to move to the right space. So you can't test out ideas how fast you would want to and if you miss something you have to wait again to try it another time.
Also that the ice makes you slip as soon as just a tiny bit of your body touches it makes the ice levels a bit fiddly to play.
I like the music but it would be nice if it wouldn't restart every time you restart a level.
So all in all pretty cool concept with potential but a few quality of life improvements and less wait time in some of the levels is needed to make this a great game.