Overall nice read. Kept me hooked all throughout. The moral struggles the main character, Todd, carries throughout the story are well tought through, and his reactions to events feel, well, human (sensation that i've found lacking in many novels). I didnt find myself becoming overly fond of neither him nor Viola for some reason, though. There are many tense moments when you definitely want them to end up pushing through, but i expected to feel more caught especially by the big cliffhanger at the end, for some reason. 
Nonetheless, both the worldbuilding and plot are quite admirable and the story was very enjoyable. It's not that i didnt care for the 'good characters' at all, both kids are lovely and seeing their relationship develop was really nice. Im planning on reading the secuel as well, where im guessing i'll become more invested in them.