Not bad...
Yes, it's worth finishing; the bunny has character and the situation is pretty amusing. It does need some more detail, especially on the backgrounds, and perhaps some more actual animation would be nice, since he didn't really do much at all. That underscored the fact that he's incredibly dumb, of course, but also kind of made it seem like you didn't care much about the movie. The ending was pretty weak, too, but you already said that you got bored with it and quit, so I understand why.
You do need a real preloader with a start button, though. Also, the end of your flash shouldn't loop back to the beginning; use a stop code and a replay button to make it end cleanly.
None of that is to say that I didn't like this movie, because I did. It just needs to be built upon some more.