Some problems...
I played it for a bit, I noticed that some notes weren't in sync with the song. And it was a few songs that had a few of these not in sync notes. But that was okay, but I noticed that when you make a mistake, sometimes it'd over do it. For instance, I was in the green, I pressed the wrong note down, and strummed when the note went by. I was then in the red, just like that. Even though it was a common mistake. So I don't know if it's suppose to do that or not, but it doesn't seem quite right to go from green to red with one miss strummed note. One other feature that would have added to the gameplay would have been held notes. Other than that it was a decent game.