my biggest compliant on was on level two. You really should add a turn or something of that nature to it because I was able to only hold up and make it to the end. other than that good job though. :)
every thing that purrnak said but also 1. if you could raise the frame rate or just make the ball movement smoother. 2. the backgrounds were kind of pointless for this style. if you could match them to the music or to the name I believe that it would be a bit better 3. also either get rid of the frames on the side and allow the ball to bounce off the side or make it so they are not a solid color.