I really dig the pixel art style, I like it even more when people animate with it.
This is one of the first animations in that style that really caught my attention:
And recently this one was uploaded to vimeo, Leo Campasso who animated the animation from the link above, also did the character animation for this one:
I never really tried animating in this style (besides from a little 3 frame test), but once I finish my graduation film, I would love to try this once.