Day R Survival
It is another free-to-play survival android game that is set in the USSR. The game includes a huge map, immersive gameplay mechanics, chemistry, all that is required to save yourself from zombies, and radiation.
LifteAfter is another survival game great pick that brings apocalyptic style to the table. With the virus sweeping the planet and leaving monsters behind, it requires you to not get killed, collect gear and try finding ways to stay alive.