http://www.youtube.com/watch?v=iSDWtCBktu0&feature=related (http://www.youtube.com/watch?v=iSDWtCBktu0&feature=related)
Take note that there will be major changes in the final release, the ending's kinda cool anyway. :D
I've seen it before, It's kind of meh to me. I seriously hope that there will be some 'major' changes, because the music is terrible for a final boss, It's supposed to make you... feel and know, that It's the last boss. And It's also kind of lame. And I expected that gigantic egg robot in episode 2 or something. And Sonic's face looks retarded at the end, I hope that they'll fix that too. Everything other than that, It's nice looking.