I consider myself a pretty huge fan of Adventure Time. That being said, I loved this!
The animation was crappy, yeah, but whatevs man. This is the kind of parody video that defines Newgrounds. When the site started it was a lot of people expressing their dislike of some of the things in pop culture: beat up barney, kill slim shady, beat up backstreet boys, etc.
Adventure Time is fair game for people to make parodies of, and with the poor voices and animation it added a certain "i dont give a fuck cuz whatever" element. That's missing from a lot of animations and games these days, seems like everybody wants to give a fuck recently.
Good job, I hope to see more.