Hello! You need to install a Renpy plug in to make it work, you also need to make sure that both apps are the same version so the game doesn't closes on you.
This is the JoiPlay app (most recent) : https://mega.nz/file/fupi0BqR#hSoWtphAoNbSgqiQQxl_HX2sfW8ZTCIWg9HTYj3JDhI
And this is the Renpy plugin (most recent):
https://mega.nz/file/jyxjVYgD#zuaY9Lh-VjDgwl4ZAOl2yLbzQtqysWibfQwg9HaNeGk
I would recommend downloading the RAR app so you can extract the files of the game more easier.
This is the video tutorial I followed and worked for me. :)
I hope it works for you. If you want, I can give you the website links if you don't trust me so you do it yourself.