How about, actual Tetris? https://tetris.com/play-tetris/ (To turn it into a "Mac app", just wrap it in Electron.)

Tetris online games: http://www.tetrisfriends.com/

Nullpomino: https://github.com/nullpomino/nullpomino

Cultris: http://gewaltig.net/

I have to say, it is sort of silly that the Tetris company doesn't take a bit of effort and port one of their current Steam, iOS, Switch or XBox games to Mac. I can't imagine that it wouldn't be profitable for them.