This was cute, but I'm not surprised there was never a follow-up. (I'd probably read it if there was, though.) The characters are such YA cliches, not what I expect from Novik!
The art style took a little getting used to. I don't know the correct way to categorize it, but sometime the characters are gorgeously stylized, and then they're drawn much younger to express their emotions. It's effective, but also a bit creepy.