After a few tries I made it through. Aleph One version 20110731 crashed with the included sounds so I removed them. The premise is to stay out of the light or the Pfhor on PCP will ruin your day. This esoteric sneak style gameplay contrasts the norm and introduces another layer of creativity for shifty scenario designers. I'm rating this 4 out of 5 because I believe the author could have included a more applicable demonstration.
A map that allows hiding in the shadows to avoid detection from enemies. Light-dodging gameplay.
Optional sounds are more echo-y varients of the default sounds for a cavernous vibe.