I actually really like the premise of this game - sending a modern team of folks into a scary darkness full of horrors known to them as the hole is thematic as hell.

I think this could use some editing and layout updates (bolding headers, removing lead indentation in paragraphs, some small organizational stuff) but it sounds like you lost your initial work and had to recreate this from memory!

I really like your inclusion of notes on how to approach starting a horror game and talking through what they do/don't want from it.  You mention folks having explicit roles but I think defining some of those archetypes (and maybe giving them a special ability?) would be really useful.