Cool game! I liked the art style and the boss designs. I also liked the attack patterns and different phases for bosses.
I don't know if it's a design choice but i would prefer if you can hold for attack rather than spamming because it can get tiring if you fight for a while.
Also the crosshair feels unprecise because it's slow and floaty. This makes it tedious to aim at body parts sometimes.
Besides these the game is looking good, good luck in development :)