Manage gun platforms on your side of the screen to overcome the enemy's side. Your commander mines the asteroid and generates money, which you can spend to buy new platforms. You'll have to move and rotate the platforms and use their special abilities to destroy the enemy commander.
*TAP on a unit to select it
*DRAG your finger on the board to move your selected unit
*DRAG a unit to change its direction
*Tap the buy button to see available units
*Drag a unit onto the field to produce it (you need to have enough resources)
*You should only be moving units on your side of the screen. Try not to cover it with your hand uselessly
Realtime mode is the way this is meant to be played. Hotseat mode is there if you're playing on a small device and prefer to change hands.
I didn't get the chance to play the game much, so if you have any suggestions on balancing units I would be happy to hear them!