Thought this was wonderful and I agree so much with OldSoulCyborg on the environment. So much so I had to make a vid of the location. Contains a potential minor story spoiler at 13 mins-
As for the mine puzzle I think you only needed 4 bodies as 2 of the glyphs are on the note near by. Plus as far as I noticed you only have one guard to run past so once your in your safe. Just dont get lost and walk out by accident like I did.
Finished this tonight, and I was enjoying it up until the very end. I got what the end was trying to do, but i just did not like it.
I too began questioning things after the spaceman etc, but i figured it was the power of the sleeper making ethan's stories open up some sort of lovecraftian dreamlands-esque parallel reality. I'm all for unreliable narrators, but the sudden "none of it was real" reveal makes me go "well what was the strawberry floating point then"?
As for the mine, i strawberry floating googled that gooseberry fool - like strawberry float was i playing pop-up zombie hide and seek in a section that killed the suspense and atmosphere through doing the same gooseberry fool over and over again.