It looks promising! But I tried to run it on Ubuntu 20.04 and it seems to not work. Do I have some packages missing? Or is it part of the game to get around this? ;)
Check your version of mono just in case (project is .Net 4.8), and check the permissions for the files you extracted.
It’s linked to the DLLs, so they need to be in the same folder and with the correct permissions to run it. If you’re running off a temp directory, my guess would be only the exe was extracted, so it can’t find the DLLs. The DLL’s are from using Terminal.GUI to build the UI (https://migueldeicaza.github.io/gui.cs/api/Terminal.Gui/Terminal.Gui.html)