I think its a little bit to "fixed"

The background could move from left to right. The guests are also not very filled with action and the back end (sry, I don't know how its called in english...tail fin?) isn't really sure about in wicht direction it wants to move. Maybe next teime i have to work on this points. But thank you for your greatings!

 I like it but i don't know , something is missing.

Thank you for your extensivley answer. This was my first picture for such a contest and as well at such a detail-level. I'am really happy about the situation that some people like this animation

The idea is good, but the execution could be better. Your dithering is too much random and your general shapes could be a little more regular. For example, the bottom part of the whale looks okay, even if the colour choice isn't the greatest, but the upper-front part of the head lacks regularity and it takes the sight away from the piece, it kind of catches the eye too much.

Also, I like the animation of the caudal fin, despite the fact that it isn't a whale's tail, but it looks like it only goes one way.

I know, it should be an exploding star, for sure :)

No, just fun. I totaly missed to transponate this star in the further animation

 One of the stars disappears during the animation. Its on the upper left of the whale.

Interesting idea. Well done.