I saw this three nights ago and didn't write about it immediately because I wanted it to sink in. After three days of pondering, here is what I think: I like this film a lot and want to see it again. The craft is truly impeccable-- confident and bold.
At first, the burning tree took me out of the film. (which is why I didn't want state my opinion about it at first.) But once I began seeing it as total metaphor and the story beyond that point becoming a fantasy, I saw the film differently. It allows the audience to participate in the revenge while still making it clear that there is no happy end here... Jen is raped, murdered and discarded. The bloody revenge of the phoenix that rises from the ashes is unfortunately only possible in the context of fantasy.