Nice game, challenging levels and nice minimalist graphics.
Controls, especially the floating ability, need some time to get used to, but overall feels nice.
I'd suggest to make it possible to jump by also using the up arrow, not just the W key, since its also possible to move left and right with arrows.
Also, moving platforms sometimes make me phase through walls and get inside other platforms.
Ultimately, i feel like it takes some excessively long time for the death animation to play and for the level to restart after you die, which, for a precision platformer game like this (which is based on trial and error), might not be a good thing, despite the transition animations looking nice (maybe you could try to speed them up or cut parts of them).
The game is very nice overll, and alreayd polished enough I think, plus for the amount of time you worked on the game, it already looks and plays amazing :D
Keep improving it!