I was surprised at how little I got to know Peter and Susan. Lucy had a juicy bit of story at the beginning of the book, and Edmund got the full character-development treatment, but I got the sense that the story was more about Narnia than it was about the children. One thing C.S. Lewis got right was the interaction between Edmund and Lucy- kids can be mean; but speaking as the oldest sibling, I was never as nice as Peter or Susan. I'm hoping that Peter and Susan will get more developed in later books.
I got the sense that LWW drew heavily from old, archetypal stories, although I can't pin any specific stories on any specific part of the book. I've heard of the Aslan-as-Jesus theory, and I can see why people might think that. It'd be interesting to trace some of the more primal sections of LWW back to myths that seem to mirror them.
LWW had a lot of symbology running rampant. There were transitions from winter to spring and stone to life, a blood sacrifice, and the return of a prodigal child, to name what stuck out to me. I'm left with the impression that LWW has a lot to offer if you want to dig deeper.
In closing, that was a short read with a lot of story stuck inside. I enjoyed reading it, and I look forward to reading more Narnia books in the future.