Dont mean to sound like an ass but...
The way the circle and the paddle is made keeps you from aiming correctly sometimes. I suggest a semicircle paddle, which would be an arc, and make it so that if it hits one of the sides that it bounces away like it would in real life. It would make for a MUCH better aiming system. Just picture a blue hotdog and you got your paddle. The music was good at first but it just gets on your nerves after awhile. The idea isnt bad at all. Try putting some space backgrounds in the circle or something and give the area outside the circle a scoreboard look or something. Well uh thats all the contructive criticism I have for today...so uh yeah.