I played your game and is working well, here is my feedback...
- feels good, framerate feels solid. it is easy to see things.
- good intuitive in game hud
- solid blocks could be a bit brighter to differentiate from background
- some music could help add atmosphere
- i like the flip gravity mechanic
- i did not understand what to do exactly, i collected everything but level didnt end
- it felt a bit punishing to reset everything when player dies