I tested the new version on Harmonium. The monsters often would spawn in the unreachable cliff scenery. However, I don't think this is the script's fault. If you stand close to the window, the monsters will see you and walk through the window into the playing area. I've had trouble like this with windows before.
I think this might be a matter of the lines being solid on both sides of the window.
Mappers will need to take extra care with unreachable scenery.
This script is playable on any map. The goal is to live as long as possible. It becomes more difficult with each round due the the increasing number of monsters spawned. I would advise playing this with a friend. When ever your friend dies you can find their body on the overhead map or the radar. Once you arrive at their body, you hit the action key to revive them. Be careful because once everyone dies the game ends.
Don't forget to host as a gametype!
Since version 3, the window error brought up by president is no longer an issue