Hmm... I'm not sure
Really and truly, this one has me stumped. It might be the child-like quality of the drawing that you've animated and the cross-overs with the rest of the piece, where there is actual animation and some basic techniques (the liquid from the bottle, the product of the brew morphing, that sort of thing), but I feel that you've been let down in a way by this.
Do not despair, perhaps a little touching up work can be done, before animating - keep the textured look to the drawing, that works well, but perhaps consider trying to re-draw some of the images, like one of the witches' faces had a smudge over the eyes and those sorts of things take away from the presentation of the piece as a whole.
I think that the writing is pretty good and the way you left it with the wizard character looking in a crystal ball could seem like a cliff hanger, though maybe have a line in there for him, as opposed to leaving it completely open ended, with part of the script that some people might miss.
Certainly worth developing and perhaps you'll be able to make more of a production of it, for future episodes. I look forward to it.
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