That sounds awesome! I need to install and play Horizon Zero Dawn (probably after January). It's just been sitting in my game library, looking at me everytime I install some other game.
I'm intrigued by the Lumen-YZE combo and excited to see what comes of it. It sounds like a grand experiment!
My own project will likely (still time to change it up!) be a Cozy OSR game. I've been pondering on the idea of reframing the OSR playstyle in less intense circumstances. I want the challenge and problem-solving to be there, as well as some element of the "lethality," but smoothed over so that 0 HP isn't death, it's more of a "I'm tired of adventures. I'm going home!" situation. Less elves and fighters, more "I live in the house with all the cats!"