Progress! Better jumping, the camera is way less lerpy, and I managed to implement a working doors system. This should also work for regular, vertical doors, but I haven't tested that yet.
Also, I stole that nifty interaction indicator from System Shock 1994. I've always liked the design of that thing and wished to implement it somewhere myself.
Up next is testing normal doors, and after that I'll have to tackle npc's and ai. I'm not looking forward to that part.