Great job!
For these being your first two flashmovies they are excellent.
I've seen a lot here on NG, must have been about 2 years or so, so I should know.
In order to improve your already well-developing skills, I would like to give some constructive criticism. (I have to admit that I am currently working on my 1st flash too, so if I accidently demand the impossible, I'm sorry. But as I said, watching extremly many other flashmovies can help a lot to prevent mistakes.)
- The drawn backgrounds didn't fit with the sprites
(maybe filling them with sprite-patterns will help?)
- The Intro with Sonic was a liiiiiittle bit boring and a liiiiittle bit long, or at least monotonous.
- Shadow's voice doesn't fit with Tails
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The Tails sprites are awesome, their animation as well. The fight sequence was great-ly executed.
Good luck with Ur future work, hope to see more.