"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away." -Antoine de Saint-Exuper.
Your music is well chosen, your animation well-synched and only you can tell if it suits your environment or not; there's no reason for it to be so bogged down. You can cut a lot of that and still have your fun running intro, even while introducing your characters. Take a look at a view popular sitcom intros and, in your head obviously, see what they actually needed and what they didn't and practice cutting the extra out. Then return to this work and you'll find you can do much better. Your physical art skill is there!
Looking forward to your future work. :)