I did a lot of lego animation a long time ago and from what I see you need to work on your camera skills. Make a rig to keep your cam steady or don't touch the camera. Make more slides per second and make them smooth and not blurry. Adding sounds helps too. Movie maker is okay, but it's not the best to use for stop motion animation. you didn't need that song in the end. Keep working on your stuff and try to get better. Good day to you.