I love the concept, I think energy drains too fast though. There should be a way to either slow the drain or to regain energy without sleeping.
I also think that every branch having an option for a ranged weapon would be a good idea as well.
I like the idea, but the whole thing is too juvenile for my taste. The artwork is too cartoony, the story seems to just be a bit of a copy of Twilight, and the dialogue seems as though it was written by a tween who thinks that is how adults talk.