A fun YA sci-fi book with some good world-building.
To me it felt a bit stupid that Spensa would go to her enemy's space school, proceed to show off her skills as a pilot (these aliens have seen her skills in combat, couldn't that blow her cover?) and teach them the best way to train their pilots.. so that they could come and kill some humans. Of course through the power of friendship it all works out in the end. She didn't really try and blend in and try to pretend to be a different alien race either - she was her usual loud/angry self, with a lot of human mannerisms.
Feels like throughout the book there wasn't really many consequences for her actions. Maybe I've read too many depressing adult sci-fi/fantasy books lately (looking at you, The Fifth Season) and this is just how YA is.