You could make a Snake game.
Make the first building a different one (or a different player)
Make 4 beacons: Up, Down, Left, Right. Put a civilian between them. Or find a building that can produce 4 different units in a way so you build a unit to change direction. Or make it so you use the minimap to tell where your "snake" is going. (This way would require less units)
Make science vessels appear in a random spots. And when you touch one, you get like +5 units in the back. (Or depending on how the game is set up)