I was unable to test killing the Dretch there with Jetpack since I did it locally by myself. In that case, the only problem is if humans kill the eggs at S1, then they have absolutely no way of dealing with the Dretch in Example 2. Example 1 is killable even at S1.
Strangely enough, I can't reproduce it now either, which is weird since it happened to me twice in a row last night... It's probably just a standard wallwalk bug (i.e. sometimes being flung off the wall when rounding corners), and not a problem with the map.
Ignore the low FPS and jerkiness, I didn't feel like optimizing the recording settings. The elevator will not go down while any player is standing on it. However, a player can walk onto it the moment it starts going down and it will go down all the way (although it goes straight back up afterwards unless they are off it again). Admittedly, I don't know of any way to fix this, but I figured I'd mention it just in case there's some obvious solution that I'm missing.
Thanks you very much <3 once you upload the fixed version I will almost definitely support this map being in rotation. Looking forward to getting to play it!