Please offer only constructive criticism. The intent of the GD Showcase is to help the developer create the best game they possibly can. Show them you support their efforts when posting.
I actually liked the paddle graphics, even without your friends help :-P. Any way here goes.
Pros:
Clean
Runs perfectly
Didn't find any bugs
Has different difficulties
Has multiplayer/singleplayer
Ai is well made
I like how you can use the mouse too, nifty :)
Cons:
Ai player's paddle is very choppy during some parts of the game.
Some of the angles the ball hits return at a weird (i think wrong) angles
Nothing else really :)
I think it's an awesome game and im sooooo happy you included the source, i appreciate it, good luck :)