The art and music is fantastic, and this is a great game first and foremost. Like some others have said, the controls feel a little bit clunky, and smoother controls would turn this great game into an absolutely fantastic one.
The only issue I encountered was when fighting the big boss. If I died, his sound effects would keep playing and I wouldn't be able to slash/enter any new doors without getting booted to the main menu.
All in all, great work!