If want to play as zombie and fight agains and interstelar alien then try Martian Zombie Survival in the great fps sci fi with option to play in 2 mods and fun. Enjoy!
*WASD* - move *down*, *up*, *left*, *right* or *arrows* - move *mouse* - look around *space* - jump *shift* - run *0*..*9* - change guns
Alpha
Super
Celeb
Space
Color
Jump
Robot
Carto
Poppy
Hippo
Alone
Metal
Gravi
Fit S
Skibi
Brick
Flowe
Big D
Fat O
Froze
Insta
Rescu
Fly C
Fish
Angry
Kawai
Spide
Girl
Candy
Candy
Block
Beat
8 Bal