Nicely done.
I have to say that I enjoyed this more than almost any other zombie based defense game that I have ever had the good luck to play. Now then, what I think may be some nice things to add.
1. Blood that dissapears with time, a lot of the later enemies blend in with the blood. It hurts the eyes, well my eyes....
2. Give a purpose to the base, I mean, I never let it die, but if its only purpose is to exist, and draw the enemy from you, then it should be removed, or allow you to take shelter within it.
3. Lower the damage!! The pancor is way too powerful, I could just stand there and let the enemy die in mass.
4. Balance the weapons better, it isn't worth buying some of the weapons, they just do too little damage, or have such a small clip that they can't be used effectively.
5. Don't do the hour by hour thing. The guy couldn't survive that many hours of constant combat. He would just wear down even with Mr. Pancor, the harbinger of death for any undead that get close.
Anyway, thats my two cents, and I hope You make another, or perhaps patch this one a bit.
Now as for all of you hopeing to playy this, just buy the auto shot guns, and get the pancor, then buy the seconday, bonuses such as speed and extra experience per hit of the enemy. Oh yes, and stay near your base. Well, happy hunting!