Played your game on stream. Beat level 1. Pretty alright style, liked the ambience. I think for a game like this though, you need high precision controls and consistent level behavior. Think of something like Super Meat Boy or Celeste. Everything is very responsive and dying always resets the cycle so there is no luck element to the timing.
For your game the main mechanic of gravity flipping felt very slow, this combined with the world state not resetting when you die made it so the start of level 2 was mostly up to luck rather than timing or player skill.
Also some of the floor and other colliders were bumpy/off. Normally this is nbd, but if you aim to make an extremely precise and challenging platformer, you need floors to be perfectly smooth, and the controls to feel super tight. And these did not.
In case you are curious, had I finished during rating time, my rating would have been:
Gameplay: 2/5
Audio: 4/5
Visuals: 3/5
Enjoyment: 2/5
Innovation: 1/5 (idk if other mechanics are added later)
Theme: 2/5