Amazing FM for its age. It took me a bit over two hours to finish on the highest difficulty.
I wasn't too invested in the story about keepers and obelisk, but I appreciate that it's there. The main thing for me in this mission was the atmosphere and gameplay. This FM is very labyrinth-like most likely because of when it was made, but it actually works in its favor in my opinion. It makes you feel like a rat in a maze at certain times nailing a spooky vibe of "I'm not sure if I want to be here". I had to look up walkthrough two times because I wasn't sure where to go next, but I believe it was mostly because of my inattentiveness. Small tip for whoever will play this one: make sure to look up a lot.
Definitely a really good FM despite its age.