Pros:

L4d1 Characters for support.
Huge ass map.
It's pretty easy when you camp by the other characters.
Tanks easy to mow down.
(normal mode)
Dagger and Riot Shield items. 

Cons:

The coms had some problems following me around the area but got to me eventually.
The sky sometimes went all black and white fuzzy colored sometimes but wasn't a crazy problem.
It was really easy with the l4d1 characters. 
The do not enter area beyond the barricade was random and sudden. Should make it more noticable

Conclusion:

In conclusion, I liked it. It was rather easy tho so I'd suggest an increase of spawn and specials with them coming at you alittle faster because when you're  by the l4d characters, its easy to shoot down anything that comes from any direction. Also you could put more items in the places that already have more items so as the difficulty increases, you can make some runs to restock on throwables and health items between spawns. But generally the problem is the waves of zombies are easy to survive with l4d chars. Keep up the good work :]

Pros:

Fun puzzles and obstacles. 
Usage of gascans to get items, creative
FUN OBSTACLES AND TRAPS.

Cons:

Not that many cons. The bots can die easily at the lazer trap.

Conclusion:

Epic. I played with a friend and we had so much fun with the traps and random doors as well as the hidden items around that you need to save gascans to obtain. Reminded me of Saw or something with the camera and stuff and how theres random shit everywhere which makes it so cool :D