Mouth movements are very out of sync which brings the quality down. I also would suggest picking up some voice actors for your future projects to add some spice to the production- plenty of whom can be found right here on the site.
That said I liked this and hope to see more from you in the future! When you don't have to rush, you can really take the time to fix things like your audio desyncing, because I could see you did animate the mouths proper. You can update this cartoon or upload a better version later!