Nothing too new or interesting
Well, it's kind of hard to say anything good or bad about it, because it really evens out. The good part about it is that the animation is good. I especially like Pikachu's cameo in this. What struck me as unentertaining was the fact that it was just this guy from Inuyasha dancing. I especially didn't like seeing his genitalia flopping all around. It seems like you should have put an "Adult" rating on this. I can't tell if that's his nipple or some shading spot on his body.
The music is alright. Of course, this is a spam flash, so it's not intended to be good. I guess that you really did succeed in that sense and you can proud of your success. At least it's probably better than most spam flashes. Is this really supposed to be celebrating the birthday of Sesshomaru, because I don't know what other purpose it has.