It has nice feeling to it but the animation is too choppy :(

Also why such a high colour count? Most of the shades you used are not even distinguishable anyway.

 I like it but I think you could make a bigger artwork and smoother animation :) 

ok thx for comment :)

Agree with MB. Even 1 px jumps look choppy with 1" frame delay, and there are randomly longer jumps. Subpixelling might be an option.

And clouds don't often move back and forth... You should either have a beginning / end with maybe a blank screen between, or cycle the clouds through the image edges (many more frames...).

But in all honesty, I think a static image would be stronger here. ;)

There is a probably accidental appearance of the birds on frame 5.

Also, 64 shades of grey???

this is an interesting piece.. but imho you should cycle the clouds better