The animation does look cool, and gives life, and you definately should keep it as small preview file, to encourage people to click on it and see the full view. The full view would be a lot better if you would lay out the entire set of tiles, next to each other, in a second file and uplad it as detail just as IllusionOfMana suggests. You will much more effectively present all the work you have done (and how much of it), and allow the viewer to compare all the tiles to each other.

I think it's kind of ok like that, it give life to it. I am more concerned with quality. Does it look as a game material?

That limitation is only for the preview image or "Small file", you can upload a detailed version at any size.
If you upload an image in "Small File" it'll become the preview icon people will see when viewing the gallery. You can upload a larger version in the "Detail File" section with your Small File version in order to show off pieces larger than 100x100.

Does not fit 100x100 if i lay it out as tiles. That's why i did it like this.

This isnt something that should really be animated. The preview is fine but you should have the entire object set or tile set on one still sheet in my opinion.