Thank you everyone! It took a bit of time but I got Good Old Games to work with New Moon 28.
I followed these instructions: https://msfn.org/board/topic/182647-my-browser-builds-part-3/?do=findComment&comment=1206460
A warning, the New Moon thread has 2 major versions, NM27 and NM28. NM27 is the one that is being updated very frequently so you need to go back a few pages to find NM28. NM27 does not work with Good Old Games.
Also, the portable version, while portable still leaves traces of "Moonchild Productions/Pale Moon" in the my app directory when it closes so that has to be deleted manually as well.