Correct the spelling error and make the font in the title menu stand out a bit more (perhaps a lighter shade of grey instead of the near black on black background) and i'd give you a B-, add about 10 sentences to why they are friends (it seems as if one gets to know the ones making wishes and their motivations better than undine and momo) and you'll nearing B and then it becomes harder to get a better rating as in my opnion A+ means no room for improvement anymore.
Yes, the art is really good (i don't like the overly use of superlatives that's why i don't say awesome, especially when there is room for improvement) but i didn't get that the curly things around jennies head is actually hair (until Momo mentioned it not being curly anymore), i thought maybe it's some ghostly essence or tentacles or smoke or something, but it's an entity with near unlimited power, why not. And i'm not quite sure why it seemed to me that the fairy's sprite did not fit the overall style but it's the only one i really did not like.