Uuuhm, the Debug version should be a low-performance but super stable version, so in principle that can't be the issue. Can you by chance link me your save files? You can find them by typing %appdata%\Godot\app_userdata\8colorsSentaiProject and pressing Enter in the Windows Explorer address bar. I suspect a flag didn't clear when you completed the game, thus causing the Arcade file to start with a "cleared last boss" state that triggered the GO! GO! GO! If you could send me your save files, I can check if this is the case.
Thanks a million in advance!