Can't play games made in the OHRRPGCE Engine.
If you try to run OHRRPGCE games with Box64 they don't work. I was testing Kaiju Big Battel: Fighto Fantasy and I ran into this issue.

Kaiju Big Battel: Fighto Fantasy
https://super-walrus-games.itch.io/kaiju-big-battel-fighto-fantasy

OHRRPGCE
https://rpg.hamsterrepublic.com/ohrrpgce/Main_Page