It's a pretty good concept, the only issues I found with it is that it gets annoying having to go back and forth until you hit a wall in order to turn around (though that's kind of the point and I enjoyed the extra challenge) and after I completed each level it would go back to the "Newgrounds: PLAY" screen and make you click "play" before being able to select the next level. The concept of the game is a good one, and the only thing I suggest actually changing is the issue with the Newgrounds "play" screen.