I'm gonna spell it awesome for you
Animation and the graphics are all throughout very nice.
The audio is a little bit out of sync. You mentioned you got the audio on a freeweb or freesound on the credits. You could match the audio by adding the frames in your actions of the animation or you could edit the tempo/the overall sound by audacity (or any freeware audio editing software would suffice).
It's at least I could suggest with. But hey! It's a promise that the next one would be better. :D