I haven't looked at this game yet but if you're looking for bounce code I always use something like this:
BounceAngle = 2 * (WallAngle - ObjectAngle) + ObjectAngle
In this case, the wallangle would be the bat and the objectangle would be the ball, bounceangle would be the new angle that the ball would bounce off into.
Although I am a lazy man and I haven't looked at the game to see if this is appropriate but at least I took the effort to post this here eh? <img src="{SMILIES_PATH}/icon_wink.gif" alt=";)" title="Wink" />