Looks better than what I expected honestly. For your first animation of this kind, this is quite good.
Your drawing/animation style remminds me alot of Sonic X and Sonic: CC (which is not a bad thing at all)
The animation looks fluid but some characters expressions (like Nights) or blast effects could be slightly better.
But still, overall, I have to say you did a good job.
I can't wait for the finished product! I hope you don't miss the date :P