WASD to move. Click to shoot. Comment your scores. My highscore is 409/318. Aiming tip: Click directly on the zombies.
If you are confused about the score keeping system, here is the explanation: the number before the slash (/) is the number of zombies your have killed. The number after is the amount of bullets you have used. The sprites are from @JeremiahMacDonald . Code by me.