Not bad
Its nothing ground breaking or a masterpiece, but its a very good attempt at music. It has its own style and has simple beats to it. Its actually nicely done, but it lacks the variety it needs to be something at which makes one want to listen to it repeatedly.
All in all its a start. I suggest adding more to it and changing things up a bit more. For someone that usually doesn't do music its a great foot in the right direction. Keep on working at it and you might have some skills to add even more personality to your flash animations.