Could do better...
I personally think you can do better. The drawings were a bit careless and it seemed sometimes you were a bit bored doing it (it happens to me sometimes... usually I scrap everything and start over again, or stop for the day... ) that it's reflected in the animation. As with the motion tweens, I don't think they were smooth enough and I would work on over 12 frames per second and make full use of software capabilities, especially the basics (easing in and out). Makes the animation a whole lot better.
Keep on trying.