Cool game!
The core idea is nice and the level design is alright, dying feels cool with the particle effects and screenshake.
Some small improvements I'd recommend:
- increase the jump height, especially in the last level it gets pretty annoying with this small jump
- maybe seperate the controls to WASD for movement and arrow keys for gravity switching, I found myself accidentaly switching gravity when I wanted to move because I still held down shift
- sometimes the camera doesn't show the other side of the room, I died once or twice because I did not see the spikes at the other side
By the way, I just found this game because I actually made one that's called basically the same! ("Which way is up?" https://jenus358.itch.io/which-way-is-up)
If you want to, you could check it out and playtest it. The game has the same basic idea, but you switch gravity with buttons placed in the levels.