You need to change the credits
Those sprites that you have used need to have credit! You cannot just say where you got them from.
Credit Deekman and Nate the Hedgehog for the sonic and shadow sprites. Also credit Domenico for the hyper shadow sprites.
And the super sonic sprites you are about to use, you need permission from Joe the Echidna Fox. Find him on the MFZ forums (Joe T.E)
Trust me, I learned the hard way about credit.
Anyways, good animation, It has motivated me to go and practise battle scenes (for my next animation, TDER part 2).
Ignore any abusive reviews, Anything that gets hurled at you just keep trying and you will do well :)
Practise
Lightning Luigi