I thought this was one of the best cartoons I've seen in a long time! What's most impressive is how good the animation is. Everything just looks so gorgeous in this. I think it really is a realistic story being told. The ending's a bit ambiguous, but that's a minor complaint. If only you had made this with a cat.
I do like works about characters stuck on islands. It's just a plot I find fascinating. I think how the protagonist realistically deals with his situation. Granted, I have no clue how that would work in real life. I've never been unfortunate enough to be stranded on a desert island. Well, maybe this one wasn't a desert.