What is the Librería Bookgame game, how does it work?

According to the introduction of Lucas Muley, Librería Bookgame is a Role Playing game on the Android platform. There is currently a 1.0 version released on Aug 19, 2018, you can see the details below.

Listado completo de todos los librojuegos publicados con su descripción completa y estadísticas. Desde esta app podrás registrarte/loguearte en tu cuenta de bookgame.me. Recibirás notificaciones cuando los creadores de alguna app que estés leyendo quiera enviarte un mensaje con algún aviso.

Fourth version of the Gamebook Library app.
New features:
1. Filter books by different criteria: title, category, language, spelling errors, favorites, completed and RPG.
2. Mark an author, or book as a favorite.
3. Direct access to chats with writers.
4. Support for tracks.
5. Support for purchases of special objects.
6. Solution to a bug: Italian language did not work.