Ghost in the Sheet is a traditional point-and-click adventure game. Each scene is little more than a locked image that you can interact with by touching hotspots. Though this kills any idea of exploration, in a strange way it almost reinforces the idea that your character is sort of "stuck" in his situation. Okay, so maybe I'm reading into things a little too much, but the combination of a gritty, industrial look and a few minor background animations help create a nice mood for the game.
Although the music doesn't do much to help further the mood created by the visuals, the ambient sounds go a long way. As you go deeper into the facility, you'll hear all manner of "haunted house" sounds that are really effective and manage to sidestep a certain amount of camp that sometimes creep in. Voicework is well done. All of the characters you come across sound believable enough and deliver their lines better than what typically passes for good acting in a videogame.