Submitted late and it was still broken!
I wanted to incorporate deceit into my game to get at the theme of "not everything being what it seems," so I devised a simple matching game where you want to move opposite colors next to each other and execute the match, assuming the displayed colors of your opponent's pieces are the pieces' actual colors. This is how it became a competitive game. Destroying all of an opponent's pieces in this way, or destroying enough that you can strike an empty space five times is a victory. Each player gets two moves/fires per turn.
This was my first time incorporating 3D graphics into a game so this was a lot of fun! They're a lot typing but a lot easier for prototyping than sprite-based games it seems...