Just... Take lessons
Its not very good. Put more effort into the execution. Transitions are glitchy please don't write your own words, that's pretty bad too. Shortness, big issue. Fix it. Animations are very very basic. 30 minutes in photoshop should be all it takes to produce low quality stuff. Take some classes, read up on it. You can improve just put the effort into it.
I gave you a zero/5 only because thats mecha sonic,not metal sonic
it was awesome pure uberness
Its been done before, but I really don't care too much about that. Animation seems good, it has room for improvement though. The main thing I don't like is the whole teleporting thing, and don't tell me they're just moving fast, its teleporting. I hope you have a good story to along with all this. Good luck on the next one.
Pretty good, esp. for your first flash. Could've been a little longer though esp. the fight scene. Good use of sprites though, well done.
yes, i was thinking the same, i'll make the next one longer