Take your time.
This was pretty dang good for a 1st (and l've seen the worst of the 1st).
It was very smooth, but lyk others have said it needs sound and a plot.
But don't be afraid of taking a long time to make a simple flash. There are some ppl that can whip out a great flash in lyk a week, and good for them, but if your just not at that level yet, then dont rush yourself. Take your time, and make sure that you are 100% happy with your creation before you submit it, even if it takes FOREVER.