Very cool and atmospheric. It was a little tricky to find that turning on the right after the fire suppressant. I even missed the turning to the air-lock in my panic But it also added to the feel, and the map's not so big that it became a frustration.
I think I got all 3 endings. 1, 2 and is the 3rd just maxing out BPM?
Playthrough: Nether Whisper Pt1 by steampunkprogrammer
EDIT: Got the third. It might be an idea to make BPM death Ending 4 so people know how many endings to shoot for.
Actually, I initially wanted to set off the self destruct, but it wasn't easy to know I should have lead with the Stick. And after you've clicked on the terminal, there's no option to back out of the Air-Lock ending.
On one hand, it's weird that I can't opt into that. On the other, I'm not sure I would have got the Escape ending if I had, and I liked ending on the third ending, so maybe it's fine.
It's not in the playthrough, but on one attempt at the third ending, after activating the terminal to unblock the way to the self-destruct terminal, I tried doubling back to see if any of the other routes had been unblocked.