All right. So I've some problems. Or him.
It seems the author uses the term galaxy and universe interchangeable and not at the same time. He says the universe is infinite and in a galaxy far far away there's another me (and in other galaxies other mes), but next he call that place as a parallel universe.
And what's parallel about it? It's just another place some further away. It's liek I would call the next town a parallel town. And the next me isn't even me just an alien, a xenomorph, a ufo or whatever.
Also I remember the universe isn't infinite, it's expanding continuously for now but definitely has an end. For human scale and mind it can be as if it was but in fact it isn't.
So maybe these really low-level thoughts about this but these are my problems. For now I'm sure I wouldn't be fan of the book.