Thanks for doing a video, and giving feedback, it some times really hard to get any good feed back from play testers.
The version you played was a tiny bit out of date, the new version has been made to help the zombies a bit more. But never less, the feed back you gave me was very good, I really liked the idea of having ruins collapsing. Main problem I have with this map though is how I built it, same goes for Grand Boat Escape, there only so much updating you can do before you just need to stop and create a new map.
about this, I have tested the new grand_boat version I there is a major problem with the moving block which stuck me every time I tried to climb them.
And also, because I have noticed you have change the weather, I think include a "random weather" would be really nice, but only if is really noticeable (unlike the same thing on predator) and nicely made. (If you don't include, it is not a problem for me, it is just an idea)