You need to space out the monsters a lot more, either through doors with timers or just much longer spawn tunnels. (Maybe have them come from one side first then the other?) Also, there needs to be more ammo, as you lose a lot of ammo if you die. You end up using just pistol and chainsaw.

Other than that, this was a fun diversion for a few minutes.

Dayum. I wish I had this back when I was still doing Warzone.
До свидания и заткнись
-P

I finished it without dying, at skill 1. I had 11 health at the end, total time with penalties: 285 seconds.

Nice attempt to a singleplayer map, but use some clipping to keep the player (and monsters!) inside the boundaries (you can trickjump on top of the skytextured boxes filled with monsters). So try to use some gameclip, clip and noclip.

P.S.
That it's a map focused on gameplay is no excuse for basic geometry or anything near that thought.

I like simple layout of the map, kind of reminds me of the Serious Sam games, the geometry however could really use some polishing.

Did you create this with a ancient version of Sauerbraten? These hudguns haven't been in any official release in, like, 7 years...