The game and its DLC are only meant to be played on Windows, Mac, and Linux — as indicated under the "download" section, and again when you choose which version of the game to download. Since JoiPlay is a third-party app, I can't offer help or support with it.
So please contact Itch support and request a refund, or follow the installation guide provided on the DLC page if you plan to play the game on a PC instead!!