It seems really good, I played most of it solo.
I'd add a couple quirks:
1. The game feels unforgiving between mutants camping the door and anomalies aren't even scarce but rather super rare for what is essentially "Yeah but honey we have STALKER at home."
2.I found the balance of containers to be lacking, sometimes 1/10 would contain a thing and I knew the game would fuck me.
3.The loot counter in the van would sometimes register starter items which I couldn't sell essentially offsetting my actual balance by +30 so when I went back it would be underhanded.
4. the "Hisser" mutant was hard to photograph, I had to trap him in ice to do so, I really like the camera gameplay but this could be balanced and I feel like the cameras themselves should cost 50 instead of 100 so when you buy them that you aren't awarded net 0 for doing so.
5.Mimics following me into the van became as prevalent as the mutants camping the door.
all in all I really like this gamemode it was extremely well put together, some of the maps could use some polish but I think for a STALKER remake this has extreme potential. There has already been so much love poured into it that what I'm suggesting is minor polish and balance, I think this is a great example of what s&box can do and felt like a completely different game, with some more additions to potential items/weapons/npcs/areas this is almost a complete game.