If you for any reason need to change some game option and you can't access in-game options menu (option that is causing game instability for example), you can do it by editing the file located in %localappdata%\TheRedSolstice\settings.ini.

There is a copy of this file (and some other files) located at <game installation directory>\bin\data. Those are backups with default values used on first game run and as a backup in case data gets corrupted. Please don't attempt to modify those files.