I'd be happy to post the usual copypaste for the JoiPlay fix(es), but someone's been going around downvoting them all (guessing it didn't work for them and they're blaming me?), feel free to scroll down to the nearest one.
Cheers man, I'll give it a few more goes at least.
So, Mikuto. JoiPlay current version 1.01.430 is broken
You can either downgrade to version 1.01.400 and disable auto-update in the playstore
https://www.patreon.com/posts/joiplay-1-01-400-51867946?l=en
Or you can enable beta builds in said playstore and use 1.01.500
There is a new beta, 1.01.630, which once more doesn't work though
Also, make sure you have the RenPy plugin too
If you have further problems, try the JoiPlay Discord