> Mac-native games (Factorio and Rimworld)
Rimworld is actually built in Unity, but without using most of Unity's conveniences; I think it just uses it as a sort of platform-independent shim: launch an empty scene and then do everything with userspace render calls rather than Unity's GameObjects. It's certainly not a /typical/ Unity game, but nor is it in any way Mac-native.
Not that that detracts from your point, really.