Hi, I tried looking over my code, but I can't find anything wrong. This doesn't seem to be an issue on PC, so perhaps there's a fix for the Joiplay app specifically? easein_circ is one of the transition easing functions built into the Ren'Py engine.
Sorry for the late reply. My phone has been doing something called 'reverse charging' where the battery percentage goes down when it should charge so I had to fix that.
My email address is loverofallthingssweet@gmail.com
If it helps at all, I can play your game, 'With Eyes Full Of Stardust' just fine. Whatever version of Ren'py you used for that game worked fine for Joiplay.
I am really sorry that you have to mess with the code for me. I really hope that I can repay you for this somehow.