I love the art style! It's actually pretty awesome how you managed to get your own style across with the artwork and make it all come together like that. I also enjoyed what I could hear of the music, and how you used guitar sounds in the menus was pretty cool! It fits the theme well, and I'd love to experience more of it.
Innovation-wise... For all I could play it just seemed like a traditional guitar hero or DDR
The biggest issue for me is the controls. The remapping screen was the only way I could find out what they were, and when I went there I got stuck on that screen with no way back. After I learned what they where, I discovered that the strumming is pretty unforgiving in terms of timing. After a few minutes of playing, I still never really managed to get anywhere.
In short, excellent art, fun concept, but its a little too difficult to play.