I loved your game, it is a simple, but very fun battle system. But what really sells the game for me is the boss pattern, it is perfectly crafted around the mechanics and I have to applaud for that. The game looks quite stunning and the choice of music is great. My two biggest problem were the controls which feel like I could get a cramp after a while and the fact that there is only a single boss. I would love to play more with new content.
I also think your game would benefit to be played on a controller.