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.