Pros:

-The scenery was beautiful
-The fog/lightning really adds to the atmosphere
-The finale was extremely unique, I haven't seen anything like it before.
-Good balance of supplies
-The pickax was fun to play around with
-The separation at the start was interesting
-The multiple paths added dimension to the map making it feel very non-linear
-The required sacrifice at the end of the campaign was not only surprising but enjoyable
-The randomization of the gears was also good, allowing for less prediction

Cons:

-The only con i can think of is that the gears must be put on in order, which can be confusing, and having to add the gears on and then activate them is also awkward.

Conclusion:

This map was honestly one of the best maps I have played. The map was not that glitchy as far as I could see, and the scenery/atmosphere was fantastic. The unique finale really made the campaign enjoyable to play. The length of the campaign was also good, taking around 50 minutes for all of the maps. All in all, I would recommend this map to anyone who is looking for a beautiful and unique experience. 

Pros:

*Very creative
*Liked the Ufo's at the beginning and end
*Gnome room was very helpful but the gnome is hard to find
*Jockey eggs were surprising
*Lots of zombies to massacre
*The giant slide

Cons:

*Weapons are hard to locate at the start
*The gigantic amount of zombies are fun to kill but it can be overwhelming
*The bots can be stupid at infinite horde parts and stay behind to kill zombies
*It is impossible to solo

Conclusion:

Overall it was a really creative and fun map. It took me a couple tries for me and my friend to get through it and it was worth it. The boss fight was fun but it would be impossible on single player. I loved the creativity of the jockey egg room, the slide, and the ufos. Overall it was a great map.

Pros:

Very creative and fun

Dark, unlike most l4d maps

Lots of health kits

Cons:

The only ones i can think of is the difficulty of finding the walkie talkie and the lever message sticking on the screen.

Conclusion:

A creative and short campaign. Little hard to find the walkie talkie but overall it was a good map.