I've played a few of these circular pong games, but I found the controls confusing, so now if you're in the top half of the circle, pressing the right arrow turns you clockwise, and turning the left arrow turns you counter-clockwise, and when you're in the bottom half of the circle; vice versa. I also decided to have a paddle in the form of a circle because there's no weird angle of reflection to deal with, and I think it turned out pretty realistic.
Thanks to @Quantum-Cat and Ms Shaws Math Class (youtube) for help with vector operations. my highscore is 37
