I love the art for this game! Really awesome and the different skeletons were great! That final boss is pretty tough lol, I thought maybe I could parry those shots but I don't think I was able to. Pretty cool idea with the gauntlet before the boss fight.
My small suggestion would be to let the player get used to the controls in like a small area leading up to the gauntlet would be good to add, maybe even introduce each type of skeleton before then locking you into the room with the gauntlet would have helped a little.
Definitely a really cool game and I could totally see adding in different enemies, maybe even different weapons/abilities and tons of really cool designed bosses as the designs are really awesome here!