The jankiness is what made it work, man! This needed to be the way it is.
Man, that was an emotional rollercoaster. Those little lols in there kept it from getting too serious, and you just sprinkled so many depressing tidbits about Fishman's life to keep it real. It was a great piece of work, and it felt very cinematic.
You should be proud of yourself, because that was a good animation in my book. Props for doing a character you like.