1. It is a clean install.
2. It happens every time, so it's not that.
3. I am using a version 12, so it may be that.
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Ok, I just uploaded another version that just uses Version 12. Not sure if it's going to matter. I did find another user on the RPGMaker forums having the same problem a month ago and it seems to have to do with a core plugin. If it still doesn't work, then the last thing I'll try is updating everything in the game tomorrow. If none of that works then I'm not sure I'll be able to do anything about it. Hopefully it doesn't come to that.
I'm gonna make the old version of the game available to download again and let me know if it does the same thing because I know for sure that that one didn't have that problem. At least that way I can know whether it's something to do with the game or your phone. I'll try updating everything in the game later when I get the time.
Huh, that's... weird. Have you modified your screen resolution or modified the hardware/software of it at all? You said other RPG Maker games ran on it before, do you know if they were made in RPGMZ or RPGMV? It may just be that if your phone is old then compatibility hasn't been maintained with the plugins in the game.
You could also try installing JoiPlay and see if that fixes it. I've never used it but someone did mention to me before that the game ran fine for them using that (It was before I released a working Mobile version). I believe it uses the Windows version of the game but I'm not sure.
If JoiPlay ends up working then I can upload a version of the game that has mobile controls for the windows version, assuming that's the version it uses.
I don't remember modifying anything on my phone.
I tried some other RPG Maker games, mostly adult games, and some were MV and most were MZ.
I got the same visual bug on JoiPlay. It was a lot slower, going to almost 8 fps on the initial city, compared to the "usual" 12-16 fps.
I really think my phone is just that bad. It's a Samsung Galaxy A21s. Should've said that earlier.
Do you have a lot of apps installed, as in most of the memory is taken up or have apps running in the background? Does your phone run slow on other apps? 12-16 FPS seems awfully low even for mobile. I'm not even sure if any of that would help but I'm at a loss of what else to try since I can't recreate it myself. Sorry I can't do more to help, I added one final version of the game that has everything up to date to see if that helps.