Let me give you some helpful feedback, as I have a lot of experience in the genre myself.
Hallways are too narrow, larger, larger, larger. Many people who begin developing in the genre rush straight into building and usually overlook the overall player experience of the game. The hallway should be wide, so that people can engage in combat properly.
Second, lighting. Your designs are detailed but the lighting isn’t quite fit. I would recommend you go around playing with lights and stuff, at some point and spot lights.
I also wanted to point out the basicness of your design. Now, I’m not saying its bad, but many who begin to engage into the SCP Genre and want to grow their SCPF forget about the appeal. Different colors, different shades. Right now it just looks bland.
Bro for a solo project this is great! but for some advice. I think a more interactive environment would help bring in more players. At the state of the game, it will only attract RP players. Things like monsters, Quests, and etc. Will widen your scope for players.