I love the animation itself. Not the slightest bit of choppy, stiff movement. That's impressive. It really is, especially considering how many other, similar videos I've seen over the years where the characters just snap into a drastically different pose every few seconds or the creator actively tries to avoid having to move characters around as much as possible for the sake of time (or mere laziness).
Honestly, the only problem here is the music. I want to see more of your content, but the music needs to be royalty-free or used with consent from the owners. Newgrounds can potentially be targeted with legal action, otherwise. Even in a situation where something falls under fair use, this site would not be able to afford the attorney fees if it was hit with a frivolous suit.
I'm genuinely sorry. I hope this doesn't discourage you from making more videos. :(
(Obviously, if you do have consent, then everything I just typed pertaining to this video is meaningless and I'm a total jerk for bringing it up.)