Okay yeah running it from Desktop works fine. Thanks!
Sure!
BTW, in the future it would probably be better to write save data into a directory in ~/Library/Application Support/ or ~/Library/Caches or the like (e.g. ~/Library/Application Support/Caterpillar Comittee/) since that’s what macOS expects for non-document save data (and they expect documents to be written out through the system file dialog). Apple is getting really strict about their security policy these days.