The animation was alright and there were little issues with it as a whole. However this ( http://prntscr.com/4cf03j ) is an issue with the camera and it also made us, the viewers, able to see what we shouldn't see. I'm not sure what happened so I can't say how to fix it. Another issue was when Mighty and Ray were running and trees were going past them; and, it lagged to high hell. I'm guessing you used the blur feature in Flash? It's a bad idea to do so. If you want something blurred (like background or foreground things) try using something like Paint.NET or Photoshop to blur an actual image to avoid this issue. Some hit sparks, dust effects and a better wind effect would have been nice, but that's just my preference.
I understand what you were trying to do with the song and it fit with the video; but, it just wasn't for me so I won't comment much on it.
If you have anymore questions shoot me a private message. I'm always happy to help and hope you find my comment useful in some way! Have a good day.