I really love the idea of building an entire world around robots. And wow... your illustrations are absolutely gorgeous! Some of them completely changed the mood while I was reading and made the world feel much more alive.
I really enjoyed the setting, and I could clearly see how Masks are central to the game's identity. The simulacra themselves feel like hollow masks: artificial beings wearing human forms while trying to preserve a civilization that no longer exists. I also interpreted the simulacra as Echoes of humanity, carrying on its memories, purpose, and routines long after the last humans disappeared. I thought that was a really elegant use of those ingredients.