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Bigsnake, I downloaded this earlier today, and I have to say, out of the three 'Z-mod' maps I've played so far, I enjoyed this one the most by far. It was the only was that had an open enough area so the player could actually move around without backing into a zombie spawn point, and I could actually see where I going in this one!
The frame rate on my computer was steady at around 18FPS; most likely because of the shader effects. Personally, I would turn them off, and just add more [static] clutter to your maps to provide the extra 'eye candy' for the player without sacrificing frame rates. Adding the crawling zombie to the spawning might also add a little variation to the game.
The weapons need some price adjustments, though their damage values seemed to be pretty accurate. I was able to buy the SAW after killing only 3 or 4 zombies, and once I obtained that weapon, I was unstoppable.

You might want to consider lowering it's ammo capacity, and raising it's price, maybe even make it available in the second or third room (later in the game).
There is one annoying bug I've noticed with all of the Z-mod maps. When you walk up to a weapon, most of the time, weather you purchase it or not, the HUD will not go away unless you walk back up to the same weapon and press either Y or N.
Overall, I think this map shows the most promise out of the three at this point. Looking forward to an update.
Kravenwolf