Overrated.
Graphics: based on the Sonic X art style, which I'm not a real fan of. On the whole, they could do with some improvement. I'm knocking off a point for Nazo in particular because, let's face it. Evil hedgehog screams post-Heroes Shadow, and the character design (which you admit is used on a promo posters) is too familiar to Silver.
Style: as you've admitted in previous review responses, the idea of 'good guy goes on revenge rampage' has been overdone. It begs the question though, as to why this movie is so similar to the aforementioned Goku/Freiza (sp?) fight.
Sound: hacking bits from the Sonic games and putting them together with one (or two?) new, untalented voice actors to plug in the gaps. Seems a mite bit lazy. Also, the song "Open Your Heart" featured, which gives you an extra point on top.
Violence: gut punches, the use of a gun (way to reference the godawful Shadow game, there), bruises that fade away and people that disappear in the face of gigantisised laser blasts... it strangely seems a little toned down.
Interactivity: naturally you're not getting many points for this, and it's not your fault for that, really.
Humour: absent, and it's probably better that way.
Conclusion: I can't say I'm fond of this flash. The idea of a mystery antagonist and DBZ-esque fights has been done to death now, even with the Sonic series. Granted the 'Dark Super Sonic' character was used - and if anyone else here suddenly thinks Digimon, give yourself a biscuit - which makes a change, but the execution of the idea on the whole is very sloppy.