Hello. Is this a brand new install or have you installed a different version that worked previously before this one?
What model of phone do you have?
I would try uninstalling and reinstalling to see if that helps.
You can also try using JoiPlay with the Ren'Py plugin:
https://www.patreon.com/posts/joiplay-1-20-032-85460458
Worst comes to worst if you just bought it and it's not working, you can contact Itch support and ask for a refund. Unfortunately some Android devices don't like to play nicely with Ren'Py sometimes.
https://itch.io/t/129454/how-are-refunds-handled