The author did a great job with that strange premise. I cared about all the characters. However, it's a Sophie Cameron book, so don't expect any answers. ;-)
Jaya is queer and there's some f/f (not with the angel).
I've watched Living with Yourself on Netflix. It's supposed to be a comedy, but I found it more sad than funny.
It stars Paul Rudd (Ant-Man), who did great playing the two versions of the character.