Great music, great gameplay. I can't wait for the finished product!
But two things that I think would be really cool to see in the game: 1) Secondary weapons (as in, you can pick up an enemy's weapon and use that as well as your sword), and 2) the ability to upload your own music into levels you make (this would make there an infinite range of music to be heard, and we could find songs that fit our levels better). Just suggestions.