Thanks broFigured it out. It's actually pretty easy.
In the JoiPlay's help server, they were kinda vague. I imagine that most people who tried it and coudn't play were listing the game via the `.exe` file, since they only say that you need to "try listing the game one more time".
In practice, you list once using the `.exe` file, in order to extract some archive. After that, you must list using the `index.html` file. Then, you can play;