Pros:

- good evolution of lets build mechanics 
-increased difficulty as the tech tree requires points which changes the strategy from your previous lets build map
-adds creativity to the barricade system and allows the player to freely choose how to construct their defenses

Cons:

-large empty space between the fuel system and generator/tech tree
-it is difficult to keep up with the hordes as they become larger the bots struggle to keep up even if you supply weapons, first aid kits etc.
-some tech tree items are overpriced such as first aid kits and defibrillators as it is so difficult to bring fuel cans to the generator
-bugs include special infected not spawning for long periods of time; barricades are buggy and it is sometimes possible for the player to pick up multiple items which interferes with their placements; recycle bin sometimes fails to recycle; objects often get stuck in ground rendering them useless as you cannot recycle nor place them.

Conclusion:

Good map with a lot of potential and i will be looking to play the final product with the "finale", however i think the distance between the gas station and tech tree needs to be reexamined. The large empty spaces also makes the common infected very annoying to run past while trying to mule gas tanks back to the tech tree. I very much enjoyed your original map and am looking forward to seeing where you will go with this sequel!

Pros:

-Unique environment with every chapter featuring something new (i.e. the streets in chapter 1, the hive in chapter 2 and so on)
-great interactive quality with different objects in every chapter from searching for keys to trying to solve puzzles  and looking for paintings
-hunter skin and dogs makes it feel like you are playing a resident evil game with a l4d2 twist and not the other way around. kudos to the author and skin creators!
-highly challenging finale diving straight into a tough combat situation which took me many tries to finish.
-nice spread of weapons throughout the map making you look around for your favourite loadout.

Cons:

-there are some bugs throughout the map, like when climbing down the ventilation shaft in the first chapter, the ladder sometimes bugs when you are near the bottom, sending you to the top of the ladder and becomes impossible to reach the bottom.
-very difficult to finish with bots, as they will sometimes kill themselves from death heights.

Conclusion:

overall a high quality map, and it can be seen that a whole lot of effort has been put into the map which is made apparent from the length of the map and the amount of depth that is put into the environment and model textures.
there is almost nothing wrong with this map, any decent player can get from start to finish with a little gray matter and some skill. only improvement that needs to be made is that map needs debugging in certain places like the vent shaft ladder. Thanks to Richy221 and well done, can't wait for the sequel (hopefully).

Pros:

-bots follow you capably throughout the map and do not get stuck and so on.

-an interesting map that is fun to explore.

-rather unique in terms of the terrain (not very many maps that look like marshland).

Cons:

-you barely notice when the "aftershocks" are happening as there is not much visual or audio to outline this effect.

-oddly placed panic events.

-in the finale tanks have very easy takedowns.

-the finale panic event may be difficult to find as it is placed in an unsuspecting location that could be mistaken for a supply depo.

-map is too short.

Conclusion:

The map has a unique feel to it because of the terrain and is fun to look around the place and explore the landmarks etc. but it needs a lot of work to give it the feel of an exciting natural disaster that the four survivors are trapped in, like added audio effects or perhaps a roof caving in every so often