This game is SO sick, I love love looooove the art direction and gameplay.
Though its details are sparse, the story just provides only what we need to know, just enough to understand what's happening.
The mother choosing not to fire at the apparition when it takes the form of something that looks like her child is sad, but telling -- and you only realize why by the time you're left at the last scene. By that point, it very quickly became one of my favorite horror games ever.