Wow, possibly yes. Let me see gameplay.
I doubt it's Myst. Myst isn't a particularly scary game.
Well I haven't played Myst myself. I've only played the sequel, Riven.
Myst III: Exile<3
I googled 90s Fps survival game and I got a game called Hexen so if it is that I will slap you, and by slap I mean post a cookie monster.