Great robot shooting game! IF you like to spend $. Big USD $. Pay to win in the game is strong. So if you don't mind dropping $'s, you'll do great! RESPONSE: Of course its optional. Spend weeks earning ingame currency to buy a minor upgrade. All the time the "pay to win" players dominate the field. CONSISTENTLY. Also remarkably bad in game customer service. I have issue tickets that I submitted weeks ago. Still no help. Huh. UPDATE: 2 months now. Still no reply from in-game "help service".