I don't mean the shaft that comes pre-spawned on the map. I mean the down shaft end item that you start with 2 of in the inventory. I placed one and used it and it sent me to the surface? Am I missing something? I thought this would send me down to level 2, and graphically it looks like it's meant to.
Additionally, when it sends me to the surface it spawns me at the starting shaft location, which I think it's also not meant to do.
Some other random feedback:
If it's easy enough to do, you probably want to disable entity shadows. Things casting shadows underground as if the sun were out is a little immersion breaking.
Is it intended that the player start with no weapon? I got jumped by a biter before I realised, had to kite it into a bunker chamber and trap it there while I researched/made an SMG and ammo. Fine if this is intentional but it seemed an odd choice.