Most planets wins. Right-click a planet (or press X) to fly in and orbit — load armies at yours, then bomb + drop to take theirs. All automatic.
WASD or the arrow keys fly: W/S throttle, A/D turn. Or right-click the map to steer — both work. Left-click fires torpedoes, Q fires the phaser.
Hold SHIFT for shields — they soak damage but burn fuel. Orbit a friendly planet to refuel and repair.
Everyone launching from one channel flies together. To play against friends, launch from a different channel.