Very fun game, I played the demo on steam. I have a few bits of feedback:
I think you should be able to rotate the level multiple times instead of having to wait for the transition to rotate again.
The mastery times I think are too easy, at least for someone who has experience with platformers.
The character facing should be with the pressed button instead of the velocity for more feedback
There seems to be a bug with being able to move in a transition, I saw this in the challenge level 2.
In the achievement menu, you can spam the button and the sound will play over itself. I think the description should also always be shown maybe at the bottom of the screen
Seems like there is no way to close the game from within the game