I'm not sure how you managed to make a pencil sketched animation look so refined and finished, but you did.
Usually this style looks like the development process of something else and doesn't really work as a piece in itself. It's great how you've worked it to a level where this isn't the case.
The sound unfortunately seems a little generalised at points and doesn't really help those scenes, but that's a very minor problem since the viewer is mostly distracted by the awesome visuals.
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