wow thats cool

woah

Great stuff

This is really clever, even the loop. It's surprisingly thought-provoking; keep up the sweet work.

think of this

for music maybe you could do this. you know the sound it makes when you rewind something? try that and it might just work.

A neat idea

I quite liked the idea of it going from one thing to another as it slowly transforms into another picture. The black and white adds to it, though the drawings lack polish in some areas such as the bat and death.

On another note, I disagree with everyone saying a song would make this better. A song is simply a side bar to accompany an animation, not to make an animation better. Afterall, some songs some people choose are disliked by others and they see the animation as less than what it could have been.

It would have been better had to made death transition into the frog, rather than pan upwards and the frog appear from the bottom. That way it would have stuck with the motif of one thing becoming another.

Nice and simple.

The animation is quite good and the transitions look cool. It also loops very well. I like the simple black & white style, it works well for this flash.
Maybe you could add some music to this? :)