The world building for the Confederation and the Adamist and Edenist societies as well as the various alien races was very well done.
They might want to rethink the choice of Al Capone, which seems a bit over the top.
All the possession contagion dovetails with our COVID concerns, yet is so different as to allow exploration by metaphor.
The instagramish phenomenon Kiera Nightly convinces youths to travel to a remote place where they are tortured until they yield to possession: Reminds me of fyrefest.
The large amount of hilarious dark humor should translate very well. For example, the sadistic edenist who overcomes possession by being the mentally strongest edenist. And the plain sadist who re-possesses his body from his possessor by being more screwed-up than a soul that had endured what amounts to hell.