You pretty much just copied miniclip's ping pong game (http://www.miniclip.com/games/ping-p ong/en/).
The pan is too sensitive, making the game even more infuriating than miniclip's one. Also, sometimes(often) the game glitches such as making the hitting noise even though it's gone out the ring.
You should add some achievements or something to make the game more entertaing because right now it's too repetitive.
Sorry for the rant.