My fiancee and I play a few games together with me on my Silicon mac, and her on my Windows gaming machine. Some games that have worked well: Divinity 2, Civ 6, Stellaris, Factorio.
Civ 6, Stellaris, and Factorio I own copies / licenses of and all three have native builds for Linux so I'd be _amazed_ if they did not also have native builds for OSX too (or failing that, at least the Linux builds should be usable).