Really cool game, I really liked the art and music and there was a nice little tutorial as well.
I really missed sound effects for things like opening locked gates and perhaps the elevator.
The vision mechanic was really cool, but the tutorial only told me that it gives me a buff. The speed I noticed right away, but the damage I had to test for myself.
Also I could easily cheese the boss with melee attacks + running around and in the 2nd phase I only stood still in front of him and spammed the melee attack.
All in all, the game is super cool, amazing job!