So I did the instructions that you put for the Mac version and it worked well up until when I tried to open it. It says UntitledDungeon is damaged and can't be open. I don't know what is wrong with it but it will not allow me to open it.
Sorry for the annoyance, this is going to be the case with most self-published software on macOS catalina or newer. 😞 Some people are able to right-click and Open, in other cases your Gatekeeper settings may require you to run a command. As the other commenter noted, Google should be helpful here. I hope you were able to get it to work.