Art is pretty simplistic and the camera movements seemed a bit choppy, but I liked this. It had a nice atmosphere and a kind of charm to it. The lack of music was pretty cool, though maybe you could have tried to use different sounds (or at least had the wind muffled) inside the cave. A clue as to why the character is there would have also been nice. The ending I think has been done before, but I still liked it, the disintegration scene was pretty cool.
Keep it up, but take some of these things into consideration for your next animation.