Pity it hasn't yet been continued.
It's been a (long) while since this animation was posted and I doubt this review will be helpful or even relevant, but I'm posting it anyway.
Several people have said voices would have made it better, but I disagree. There is a rhythm to this animation, with the way the images move along with the music as if they were an extension of the sound rather than a foreground to background music. The ambiance and tone are shaped through this, giving it that dark and eerie sci-fi detachment that makes it so intriguing.
Maybe voices should be taken into consideration for future entries (if any are ever made...) so that the plot can be more easily advanced, but this one works wonderfully as it is.
Aside from the amazing intro, those orbiting spheres that hint at something far beyond the human scale we're accustomed to, the visuals do need a bit of refinement, but I'm sure the animator, wherever s/he is, has improved during these years.