Alright, but some annoying problems
Well, I noticed one bug that was rather annoying. Whenever you get your grade, and you go to the main screen, it jumps back to the grade screen real fast first. You basically have to hit the button twice for it to stay on the main screen. Also, when you hit the button to start while the screen is still sliding, there will be blank space on either the left or right of the screen (due to it not being centred).
My other problem was that the learning curve for some songs was ridiculous. I could do most on easy no problem, but when trying medium, they suddenly got a lot harder. There's no smooth tranisition, and nothing to get the player accustomed to the buttons. You just kind of throw all 7 at the player at once, forcing them to know how to use them all, or else fail.
Lastly, it seemed like it only took maybe 10 mistakes to fail, which is not many. When that many bars are coming down at a time, it should take a bit more than that to fail.
Overall, it is a fun game, but the learning curve is much too steep. If you maybe added more songs, fixed some things, and made it a download as a separate program, I would love to play that. But as for this version, well, it's a beta, so you can still improve.