Not bad
There's just a few things that I feel you could have done much better. For one, the voices were very monotone without expression (which made the movie get boring after a long while). Secondly, you could have had some low music in the background or something cause alot of the time it was just really quiet. Finally, yea you're right, the voices were out of sync. Next time try and make the animation THEN do the voice acting. Aside from that, great job.