Not bad, but needs a little work
You get your point across pretty well, so I'm not going to give you any advice on how to improve your story telling. Your animation however, well pretty impressive, could use some work...
For example, you might want to experiment with easing your tweens. Pretty much everything here move at a constant rate, stopping and starting nearly immediately. The truck was a good example for this. If you eased it into its stopping, it would look more realistic, rather than just having it stop immediately. Experiment with it, it'll help you.
The other big problem I had with this is your awareness of the stage. Keep in mind that everything on the stage will be shown to your audience unless you are using a camera device (I can't remember what they're called). A lot of times, we can see the edges of things around the background. When we see the line of coats at the end, we can see the white behind them. Make sure that you're filling your stage. At some points, zooming in a bit would cover the animation mistakes (take a look at the guy when he peeks into the bushes, he doesn't have feet at first).
But you show a generous amount of skill in animation. The things that you hand animated looked really good and even your tweens looked relatively natural (with the exception of the easing). Your drawing style is good. You just need to clean things up a bit, then you'll get a higher score. Keep it up though, I'm excited to see what you come up with next.