Interesting concept. I have to agree that at first the controls were confusing. It would have been helpful if there was a small tutorial. I mostly found myself out of the screen racking up points instead of being inside having to avoid enemies. It would have been nice if the game was contained inside of that space because once you get out of the screen you can definitely get back, but it is harder to get a feel for where your momentum is at. When you do make it back and appear, you just become like a shooting star across the screen.