Very visually appealing game! You used Unity's 2D lighting very well, and the pixel art is good. I would usually advise to keep the pixels per unit consistent across sprites, but it honestly doesn't look too bad here as there isn't that much of a difference between the most and least detailed sprites. My only critique of the art is that the spikes don't exactly look like spikes, they sort of look like awkward 45° slopes... try making them pointier!
The game mechanics and platforming are kind of annoying though. There's no way to do high or low jumps except with the flight mechanic, which isn't exactly well executed. It takes forever for the flight power to recharge, and the flight power should regenerate while you die, not be wiped (although it occasionally does regenerate?!). If you want to jump high you have to perform insanely fast double-clicks of spacebar since it simply reduces the player's gravity - maybe perhaps try capping the player's fall speed to a glide while spacebar is held? It would also be nice if it didn't require a second press of spacebar, and you could simply hold to do a long glide-jump. Also, please add checkpoints of some description next time (not sure how it would have fit in with the whole random lever thing in this game though...). I acknowledge that this seems to be your first platformer (at least on itch.io) though, so these are just some tips for the future!