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I'll jump straight to the area where you could improve, since it seems like that's what you're after:
x Smoother animation - I.E. eye blinks
x Even though the sketchy style made this submission more original, I think it would be better clean.
x A better story, if any even existed.
x At points where characters were speaking, even though it probably wouldn't be what they said/sang, it would be neat if it synced to the song
x General improvement with detail in the background
A good submission overall - Good luck with further projects :)