Not Bad
Your backgrounds are great and the overall art style works for the piece. This shows a great deal of effort and it's something you can be proud of.
In your sequel, and there should definitely be one, be sure to address the following:
1) Change the name of Narnia - Unless this is based on C.S. Lewis' seven volume set of "The Chronicles of Narnia" (I didn't see any credit to him or see any hints it was the same world from his books, but I read them many years ago), I would suggest you change the name. It'd be like calling the location "Tatooine" or "Cimmeria" without any relation to Star Wars or Conan. It could also bring up copyright issues.
2) Sound synching - I watched it twice, once at medium quality as per your suggestion and once at low quality and the synching was still a bit off.
3) Voice acting - While the actor was fine, he lacked the ability to draw the viewer into the story. Use actors who evoke emotion much better.
Overall, I think you have a pretty nifty project here and I'd like to see you continue. Best of luck on future episodes!