Reealy cute! Loved it!
But i think that the "dust" could be a litle better if it has 2 gray pixels in the third frame, rather than one black pixel, and also put a single gray pixel on the forth frame. This way the dust don't look's like it teleports too fast and it looks like it fades away slowly rather than vanishing all out of sudden.
Of course it dosent look like a lot of diference, but it kinda annoy me a little when i look at that single pixel moving too fast.
Thank you for the comment, I think you are right !
Gonna try to do something about it