I like the idea of being in darkness and the zombies could be right there at the edge. Of course, you didn't give me a lot of bullets, nor did there seem to be any way to replenish my supply. That's just cruel.
Hmm... yeah I have it so you start at a random ammount of bullets, but there is a frequent spawn of ammo for the pistol; (currently none for the grenade launcher) but maybe you didn't look hard enough? haha, or maybe your version is behind... but there is ammo that spawns.