I played Through the Fire and Flames, from Dragonforce... I'll never do that again T.T
This game reminds me Vector Stunt (another game on NG): you also can play with your own MP3s, but it was another kind of game. I like this concept. You can enjoy the music you like while playing a game based on this music. I don't have anything else to add. Everything was said in the previous reviews.
It's a nice game. Keep up your work! =)