Not bad
For a trailer, you definatly have drawn me to interest for your flash idea in the making. Although at first this trailer seemed very vague and empty, you cleared up most of my "Where are all the epic Sonic characters?" with your drawing of the classic loop that ,in this case, Tails ran off of.
Although interesting.. This is of more a personal interest then an interest in your art and animation. Things need to be abit polished up.. Working on a production that extra little bit, even when you think it is ready, will improve it more and more.
Goodluck on the flash.. Nice trailer.