I liked it quite a bit
It's got a good story, even if short and peculiar, but there's nothing wrong with peculiar. I found it pretty sad though, in an emotional sense, not in a "Man, that's just sad" kind of sense. I was a bit confused about why she set the squirrel on fire until I read your description, then it made quite a bit more sense, but I'm not entirely clear on whether she intended to set the tree on fire too. I expected the food she gave the tree to just fall down it, but the way you worked it was equally good.
Overall a very good film, and like others have said, you're an excellent artist. I don't think your talents are really being wasted at all, assuming that this is the style/kind of thing you enjoy doing.
Good luck in the future and may the front page be with you.