I was trying out parsec for the first time, and most of the games we tried were lame or didn't work without a gamepad, but this game works like a charm!
The four game modes are simple fun and once you've tried each, you can mix and match them to make more complicated games.
One bug report: when you unlock custom mode or a new rule for it, you have to press "A" on the gamepad to proceed. But there is no equivalent button for the keyboard. We didn't have a gamepad, so we had to close the game each time we unlocked a rule.