The bad: Way too short, or too slight even for its short page length. Characters aren't particularly complex; Nyetta is alternately too precocious and too much of a child, and Eve's trauma as a youth was glossed over. Lark is annoyingly moody as a ghost and not, and Ian seems to exist in the story so there'd be one good male character. An early chapter is extremely heavy-handed, but thankfully that stops. The ending seems very abrupt.
The good: Despite their lack of depth and complexity, I grew to like most of the characters, even though the titular one never really got much sympathy from me. (It's sad she died, but... that's about it.) The writing is occasionally really really good. It gets surprising mileage out of its concept, though a more linear storytelling method would probably have benefited it. The gruesomest scenes are handled very well. Overall, Nyetta is endlessly enjoyable.
Overall: An intermittently fascinating read that nevertheless disappointed me, though I don't regret reading it.