Very good Zombie game. I can understand your desire to try and make it more "Real", though it's curious to say you want to give the player the "barest" of weapons when they're able to purchase military grenades and mines, maybe placing a little context there could help. The unlimited ammo is understandable, though perhaps you could have a kind of ammo cost per night, increasing gradually, though the ammo can still be unlimited. Another little thing is some bug I encountered (Not sure when, it would be nice to have a level counter.) I had exited the purchase screen and it was pretty far into the game, but no zombies appeared, forcing me to quit :(. One other little point, when a player loses a line of defense it would make more sense for them to just have to re-buy it, rather than hit the cheaper repair button. You get so much cash late into the game if you're a decent player, it would be good to have to make use of some of it :).