Challenging, probably fun for speedrunners. The difficulty made it slightly frustrating for me though. I stranded at the second or third time inversion stage. I found the inversion interesting. A bigger or more in your face time indication, might help the player. To get some more sense of achievement, a different sound when you enter a new stage might be nice.
The colors are a bit murky and not very inviting to me. The gameplay is very smooth though and it seems as though you’ve put a lot of effort in the level design.