Pretty good but...
I enjoyed the video I just have a few things I'll give my input on.
First of all was the music. I felt it went with your video very well, but it also took away from it. In a movie like this, the music is supposed to be in the background and subtly complement the movie. After all, the video's yours, not the music. However in this movie I felt like at certain times the focus was more on the music than on the video itself, which isn't usually what you want. You can use the music to add effect and emphasize a point in your video, but here it was just loud and distracted from it I felt.
Second, I thought the animation was sharp, and it looked good for the most part. The only thing I was displeased by was the alien cube. I realize you may have been going for an extraterrestrial look, but it just kind of stuck out and that's not what you want.
Other than that I thought it was a very good video and I enjoyed it. I don't mean to be so focused on the negative, but it's just what I think you can improve on. Aside from my two main points I thought the video was great and yo did a wonderful job.