Mike,
That looks good. I agree that there are times that increasing the tempo would look cool but I would base that solely on the music playing at that time. It looks good though so keep up the good work. If you feel the urge to add anything the only thing I would add would be strobes of a color like blue. Just to add a little to the effect of the tree.
Perhaps, the animation would have a better effect with music but the crickets are a nice touch.
Corey