Awesome - no, near perfect!
This flash features some of the slickest sprite animation that I've ever seen. You've got awesome battle scenes that are well choreographed and end before being overdone (it was a close call with the first Zero battle, but things were mixed up, so it was all good). You added your own flavor to some attacks, both in their effects and reusage of old X sound effects for extra fun. I personally loved the reintroduction of old buster SFX.
This flash also features some great voice talent. Omahdon is ****ing incredible - I love the voice that combines sophistication, maturity, and a bit of hardcoreness, all to make a great personality. Lucien (especially in battle) and Mizura are solid additions and Tam Tu shows another great talent in all six personas (all of which I enjoyed, excepting Flizard - he sounded too 'insane child' cliche for my tastes). Leviathan's battle cry was a tad girlish, but otherwise I enjoyed her voice. In fact, the only voice that I had a real problem with was Foxphere as Zero. Excepting a few battle grunts, he sounded very jockish, not like the action hero the flash has him out to be. To fix the voice, stop acknowledging that he's acting and just get into character.
The sound effects were just like the animation: silky smooth. No complains here or on most of the music. The Naruto music is a tad cliche... it's overused enough in the series and really sticks out. HOWEVER - being a big Naruto fan, I loved Extra #2.
As for the extras:
The preloader and menu screen are wonderful - another testament to the fluidity and hard work invested in their flash.
Extra #1 is a great addition, in my opinion. It adds to the story but as an extra does not interrupt the action.
Extra #2 increased my love on this to a new level. Besides the great voicework from Tam Tu (^_^) and Kagura, it played upon some of the things that I love in the series... the earlier episodes, anyway.
Anyhoo, to summarize, amazing work, amazing team, amazing job.