Gloriously Simple.

Look at that little box. It's a very rare occasion that I get to see something so simple but so adorable. The art style is kind of reminiscent of minimalist web-cartoons, so you got points for that. Being that there really isn't much else to the movie, that's probably your strongest point.

The next best thing was the music. A really superb choice that reminded me of Pirates of the Caribbean. The irony of putting that song with the simple box was brilliant, and even a little humorous. You seemed to pull off a joke without even doing anything.

That being said, there's probably room for improvement. The dramatic cuts were nice, like zooming in on the box's face, but a little more animation would not have gone unnoticed. Maybe slow it down, or pan around; you wouldn't have to do much. As is, I really like it!