Pretty cool, however the movie takes too long to load for such a short animation. I can understand there is music, but it took me a while to load on my relatively good connection, so I don't know. 1.8 mb shouldn't be that bad.
Music fit the theme, and the animation was fluid. One suggestion I do have would be to make the background move up and down a bit aswell (the grass and tree blocks), to give it a tiny bit of depth in it.
Maybe make the background, the stone mountains or whatever that is, move a tiny bit less aswell.
Overall the animation is good, music fits, but overall the animation is way too repetitive. I know it's supposed to be a loop, but I mean you could use those animating skills to make a fully featured Minecraft or whatever else you want movie!
Good luck with the rest!
- lemon42