Realms of the Haunting
filfre.net
filfre.net
Folks who haven’t played this-the playthrough by Kikoskia is quite interesting: https://www.youtube.com/watch?v=e_mkpxHcdew
It doesn’t usually get attention as one in my experience, but there are definitely significant immersive sim elements to RotH, especially the manner in which you can uncouple the mouse from aim looking to then interact with the environment, much like the aforementioned system shock.
I played it on release and played it again a few years ago - it has a certain charm for all its many, many faults. If you enjoy the silliness of many 90s FMV titles, this is one of the best in that regard.