Mike, are the code compiled considering the .net framework? Mono already allows .net dll codes to be executed.
I may be of (some) assistance, since I work in development...
I may lend some of my time to investigate further...
I am using GameMaker Studio 2 in my McBook Pro and the graphics (and animations) are not rendering.
Does the GameMaker plugin support MacOS or is it I that am doing something wrong?
(Works fine in windows, though)