It's monogame, but I was going to steal your build system for generating the app bundle. ;)
you can't just plop a monogame binary into a love bundle... the fixed version doesn't open at all. Doesn't monogame have its own cross-platform build targeting system?
I ended up rewriting the package file based on some docs I saw, the build system I'm using for monogame does not, I'll need to keep digging.