I didn't see this until now, but I love Starbound and The Witcher (the first game). But idk if you've upgraded your OS. Steam says that some of their games might not work on Catalina: Steam and macOS 10.15 Catalina - Mac Issues - Knowledge Base - Steam Support

I think Starbound works regardless of OS version though. I haven't tried, however, because I am not upgrading my OS.

Edit: There is also Stardew Valley on Mac