Just a suggestion, how about changing the unlimited ammo starting pistol with a melee like a stun baton or a knife as a quick switch weapon. And just give us the pistol with light ammo of 14/56. You could really incorporate some game mechanics from COD Zombies like buying traps or ammo from the weapon stack again. Anyhow enjoyed it, reminded me of Flash Games like the The Last Stand Series(SFW).