Here's my opinion
Well, I'm a Guitar Hero and a rythm game fan myself, so I decided to play this. And I gotta say, you did pretty well. The graphics and the overall design is really good. The reason I'm giving a 6/10, is because of the gameplay. I think it's just because of my computer, but even on low quality it's running very slowly. I'm not giving it 0 points and doing a massive rant, because I'm sure it'll work fine, if I'll try it with another computer.
So, yeah, good job with the game, and Merry Christmas.