The location of the save files depend on the OS. If you use the browser version I think you can't just grab the save file.
I guess it should be
Windows: %APPDATA%\Godot\app_userdata\RNG Quest
Linux: ~/.local/share/godot/app_userdata/RNG Quest
Disabling skill modules in the option tab only prevents the creation of new skills, not the usage of existing skills.