Copypasta from my review:
5/5
Good metroidvania.
Nix's movement speed was satifyingly fast.
Difficulty felt fair most of the time.
Good dungeon layout.
I found some bugs, but most were either harmless or even helpful for the gameplay.
Pretty much my only complaint is that the game is not very responsive for ducking and looking up. (which might be a bit of a problem in some bosses)