Clever short! I like the progression and idea. It's short and sweet and provides a quick cinematic thrill.
As a suggestion for other shorts, you may wish to crop the camera shot in ever-so-slightly to avoid the extraneous space, as this is distracting to the overall effect. To circumvent this, you may wish to add a little "lego landscape" to hold attention to the foreground, before the eye naturally observes the background. I understand this was to test muzzle flares, so I suggest this for future pieces which I hope to see.
As stated in the aforementioned post, a little compression in aspect ratio couldn't hurt.
This would make the viewing experience a bit more pleasant for viewers and fans.
Good stuff and great stop motion presentation!