Thanks for the interest! I found that I didn't mark several key files (sprite fonts and map data) for inclusion in the oneclick installer publish, so I've uploaded another publish file with those files. You'd need to uninstall the old one first.
I also uploaded another zip file of the application directory that may be able to 'just run', although the installer was supposed to get any prerequisites if needed. It's my first time trying to publish an application build with Monogame/Opengl and it's been kinda a headache.