If only everyone experimented like this
I have to say, this is the best "test" of flash I've seen. If everyone's test submissions were this good, I would be able to die without regret. Some may jabber on about adding some sort of plot or whatnot, but comparing this to it's peers, you've earned a 5. Excellent animation quality, and good music accompanyment. Yes, yes, a plot will help things along, but this is a marvelous start. Keep it up!