Hey there!

I had a lot of fun with your map and it seems like you made sure to implement quite a few unique ideas into it (I find the verticality aspect especially compelling), but in its current state it has a whole array of bugs that you might want to take a look at.

Here are some things I noticed:

• A bunch of shadows and small objects keep a- and disappearing constantly, because their presence seems to be determined by the distance between them and the player
  
• You can partially walk inside the first debris
  
• Vulture Aid has severe graphical bugs (giant big squares instead of green smoke)
  
• You always get blocked by landings a little bit when you climb the stairs. You should, therefore, extand the openings and also make the stairs wider, so that ...
  
• Zombies don't pile up there the entire time
  
• Zombies stop moving spontaneously on several occasions
  
• You might want to get rid of the genitive in "X Zombie's left" and "X Dog's left"

I know you said that you are currently not planning on working on this map anymore, but even so, these could be things to consider for your next map as well.