I listened on audio bc Pedro, like most of us. 
And I was confused the majority of the time, but intrigued enough to keep going. The ending left me with a laundry list of questions. 
The way Joaquin kind of dissolves into paranoia and hysteria reminded me of The Crying of Lot 49 by Thomas Pynchon.
The ending was not what I expected (but hard to have expectations when you're constantly confused about what's going on 😂) but...I'm not mad about it? 
I mean, it really held my attention.