I literally just walked uneventfully from floor 8 to floor 1 at ever a slow pace, and each hallway looked exactly the same as the next except for the numbers changing. Later got the full save someone posted to look at the offerings, but no gallery mode, I had to walk through the hallway again in hopes of getting grabbed, which was a confusing ordeal because some of the spawned anomalities don't actually do anything as far as I can tell.
And for us lesbian fans, there is one lesbian scene and it's not much to write home about. Your shadow doppelganger plays with your clit in a single animation loop and then you cum and are left soaked. Not a bad scenario in and of itself, but the execution is pretty bland. Most of the rest is hetero with non-descript male shadows, a possession masturbation scene exists too. I'd skip it, even from a "skip the gameplay, watch the gallery" point of view.