Pretty entertaining actually
For a first try it was good. Maybe not so great in quality, but this is enjoyable. You put in some great choices of music, the humor was small, but funny.
I like the idea of Teddy zombies. By any chance, are the Teddiez related to those in Conker's Bad Fur Day?
Work on a movie with a larger frame rate (try 24. It's easy to get used to after 12) so that you can have smoother animation. Not a keyframe every two frames for somebody simply walking across the screen. Put some more detail in your characters since that's what we see the whole time. You'll be good in no time.