Certainly could have been better.
It's an okay game. I know it's your first game, so I'll try go easy on you. The premise is good, a simple Sonic vs. Dr. Eggman RPG-like mini-game. But it's littered with many small problems that it makes it very unappealing. First, I think you could have used some better music, possibly one from a Sonic game to give it more of a Sonic kind of feel. The main problem though is how easy and repetitive it is. You never really have to try, just keep hitting the attack command, maybe using the Special attack once, and you win. If you could somehow add a little spice to it to make it a little more exciting, or give Eggman a little more power in his attacks, this could turn out great. And just a little advice, having the characters stand completely still when the're not attacking makes it look kind of motiionless and choppy.