Pixelart can be tricky sometimes, specially with deatils. It looks pretty nice overall, I think its legs are missing the black contour but the animation is pretty good.
I also work with pixelart and even so I didn't know about aseprite.
Is it easy to use?
It is pretty fun to use but it is not open-source. I think it is about 15 dollars. What have you been using?
I looked at some pixel tutorials and I noticed that black contours seem to be bad practice when you are working with few pixels. Making them a darker or ligther version of the filled area generates a nicer look. So I will redo all the contours :o)