Got a few pointers;
But it was actually pretty well done, it looks like an anime opening for an original series. Kudos. A bit heavy with the Hare Hare Yukai influence, but hey, I love that dance.
As for everyone bitching about the black screen: Be patient. If it didn't load after what a 10 meg movie usually takes for you, then refresh, your load errored. It's Newgrounds, it happens. Don't blam her for your computer being ass, or the server hiccuping. :(
Anyway; pointers.... considering its length, that was actually pretty sad for a 10 meg movie. Still cute though, and worth a bit of a watch. Have you thought of taking a shot at flash? It's expensive to buy, but most people on NG don't buy it, they just get the trial and find a key.
The watermark: Annoying as all hell. If you can, please move it to a corner. I've never messed with this "avs4you" thing though, so I don't know if its possible. again, flash is a great alternative, even though I hate Adobe for buying them out.
The art itself: Kudos, blurry though. Jpeg'd? I like your style, the character designs, and the color designs. I'm intrigued, are these just random OC's, or is this for a story?
The animation itself: Very, very choppy. I have a feeling you drew each panel, then put them together, right? the motion lines are generally not necessary when it comes to animation. More frames were really needed between each movement. Repeated actions but different characters only work if they have their own unique way of leaving, or you don't drill it to death. The whole jumping into the background was cool for the first 3 times, same goes with the same dance moves. Might've been better with the dance if you added more characters to the dance as it went on, dancing with her.
I did love the general concept of it, and it was interesting, but there's room for improvement. Gave ya a 5 to counter anyone blamming you for the loading issue, I would've given you a 3 otherwise.
Good work never the less, and hope you don't take this review too harshly, never stop animating raveniga! and good luck on your next movie!