The Bookshelf is a single-player thing that roughly could be described as a ritual, a journaling game, or a mindfulness exercise. You play by organizing your bookshelf, and by occasionally using the things you find as prompts for a story.
Also sometimes you brutally konmari a stray magazine.
The PDF is 4 pages, with some nice victorian black-and-white illustrations and a clean and readable layout.
Overall, if you like games that don't quite feel like games, or if you have a bookshelf that's been getting feral, you may want to check this out.