How about Playing Mayhem Area? In this game you have to survive by killing zombies. Make good use of the help, the ammo is very limited!
W to Jump A to Left D to Right Left Click to Fire
Zombi
Angry
Stick
Braid
Buggy
Clash
Ben 1
Winte
Obung
Santa
Maze
Crush
Angry
World
Princ
Photo
Weddi
Hoppy
Battl
Creep
Duckl
Laser
Best
Carpe
Fab T
Round
Stree
Yummy
Dora
Goldi
Monst
Creat
Simpl