Description: O.A.S.I.S is a simple wave-based zombie survival shooter that combines the best elements of classic arcade-style shooters with the atmosphere of an alternate 80's dystopian world. Designed to give you and you're friends a break from online competitive shooters. You must fight off hordes of the undead as they relentlessly pursue you through the Levels. With each passing wave, the zombies become stronger and more dangerous, forcing you to constantly adapt your strategies and weapons to stay alive.