so what did i like and what did i not like:
like: the work you put into it. making so many modifications to the sprite sheet of shadow must have taken you a long time to do, and it looks like you tried hard to make something good.
what i didnt like: the overall outcome. this falls under almost all cliche in anime intros. the "melancolic-sitting-alone and staring into space" part the "good guy turns bad for a wile" a sprinkle of "love affection" and a lot of flashing and close ups of the characters. i just really lacks originality.
when you are doing something like sonic (that has been done by other countless people) you really need to set your self apart from the rest. this intro in no way makes me want to see the actual episode. keep working on things, you are really into it, but you just need to push harder