I don't know about codes but you can adjust your game to be used in joiplay since it already has the tools, but I would also greatly appreciate it if it were in Spanish. I have to use a translator to play it.
If you have time to play I would like you to grab this game for yourself the creator is Chinese so I don't think he'll notice, I would like you to update animations and such and upload it as your own https://tioeroge.blogspot.com/2024/06/curious-tales-of-yaezujima-rinko.html
It's a very good game, it just needs animations, anyway, good luck Bro, I'll play your games.