Put some more effort in it!
It seems you spent far too much time designing the menu, which was the only thing that acctually looked decent. And that was mostly thanks to the newground tank. The instructions were hard to read because the Ls looked like Zs, and the F like 7. Took me a while to dechiffer. The gameplay isn't bad, it's non existent im afraid. Try making a bigger arena and slow the zombies down so that it is possible to outrun them. And I didn't even find the easter egg, but unless it was an entirely new, upgraded version of this game, it wouldn't have helped your score.
Next time, try spending more time on making the game enjoyable. Slower zombies, more graphics (sticks? seriously), bigger arena. Maybe add some weapons? I mean, survival horror is fun, watching some black stickman trotting two steps to the left before a shoddy "score" table appears is however not.