This stealth/avoidance-based horror game is extremely short, simple, and fair. It is my favorite kind of horror game: one which doesn't have any jump scares, yet still manages to get a jump out of you from the mechanics and atmosphere alone. (In this case, the player moves quickly, has limited vision, and there are many ghosts moving around the level, so it is easy to turn a corner at high speed and run right into a ghost that you weren't expecting.)