This is a masterful riff on Nobilis, both in terms of creating a compelling cosmology and having that distinctive back-and-forth of dialogue and exegesis. I love how much playability is crammed into such a small space, with an obvious gameplay loop (do miracles, get prayer, build heat, dodge Angels, repeat).
I really, really can't wait to see this fleshed out and explored as a full game in and of itself!