I wasn't expecting to play a game with a mature theme and story. Although I don't normally play games such as this one, I respect the creators for wanting to focus on a mature experience supported by its story and ambience. The pixel art is strong, and I like the added visual effects such as the pixel light sources and the shadow effects when passing through corridors. Passing by corpses of your previous attempts were disturbing (in an effective way) that adds to the atmosphere. I can't say the level design and gameplay match in quality; its mainly a walking corridor simulator. While being wary of your step counter has narrative effect, it ends up leading to trial and error as you figure out which way your supposed to go. But as I said, the narrative, art direction and ambience help make up for it.
(On a minor note, I experienced a bug where I walked through a solid wall, but wasn't game-breaking.)
Props to the developers for tackling a mature theme!