I like the monochromatic color palette.
However, the game is seemingly very hard! There are a lot of enemies, and they move quite fast, and the attack animation is pretty long, so you get submerged instantly. The only way I managed to survive was by exploiting what seems to be a bug: moving cancels the attack animation so you can attack again instantly. If that is intended, it should be made more clear I think!
Wishing you the best on your gamedev journey!