ONeill Tennis 1.02
You can download for Windows, Mac, or Linux .
The game itself is only moderately fun but I really enjoy just watching the ball move through the air. It's so hypnotically different to motion on earth.
If you want to play around with the project further you are welcome to build off my source code (available here) for any purpose. Changing player speeds, rotation rates, and ball speeds should be as simple as changing a parameter in GameBehavior.cs.