Beautiful!
This video is admirably beautiful, not only for the visual art, but for the way that it conveys emotion through meaningful flashbacks and insight into the minds of the characters. The grief of the characters felt through this video is very clear and potent, and the characters' expressions reflect this.
More closely, Snively looks absolutely villainous, as opposed to his rather hokey depiction in the comics. Also, the color of Sonic's eyes is well-connected to the flow of his conscience, especially towards the end. Every detail is powerful.
And the music is great. I don't think there exists a better track to fit this video. The sound is somber yet vital. It is a perfect echo of the emotion felt throughout this video.
All in all, this is a great video that made my favorites list instantly. Keep up the good work!