Arrow keys to move, hit the ball. Space to change camera mode. (hint hint: topdown is easier!) "O" key to turn overlay on/off. Q/A keys to increase/decrease AI_Precision (the LOWER this variable is, the more accurate it'll be). Yeah, I know...I was lazy for not implementing much of a UI, but hey; it's still cool, right? Warning: If you prone to seizures and that sort of thing, you might not wanna play this...
I just added a bit of the retro style