Not bad
One of the better rhythm flash games I've played (here on newgrounds).
Kind of short though. And I'm not really a "metal" kind of dude. But I liked the idea. Reminded me of Gitaroo Man for PS2.
I suggest making a sequel. Longer would be nice. Multiple levels, and after beating them you can go back to them...like maybe a cheat or something given at the end to play all the levels. Or just make all the levels available in the beginning.
I'd play it! Regardless of what music...knight kicking ass = a-okay with me!