My main problems with the story were: - The setting was almost unspeakably brutal, but there seemed to be almost no one interested in fighting those brutal systems. I could understand 1-2 characters being brainwashed to go along with the brutality, or even most, but no one seems to even attempt to go against the system. This made the setting feel unbelievable to me.
- There are two big twists at the end of the book. I won't spoil them, but they didn't feel like well-foreshadowed twists. The timelines for the different chapters weren't clear, which made it hard to guess the first, and the 'clues' felt like bad writing mistakes. For the second, the only clue is what words people don't say.
The plot also hinges on a misunderstanding of how tsunamis work, but that's forgivable to me.