Loved it. The music and visuals are perfect and the story has real emotional heft. Genuinely moving, all the better for its stark simplicity. I guess I would have liked the spinning effect to play more of a part in the levels, perhaps changing the orientation of the character, but that's not really a criticism - just me musing on ways the concept could be taken further. Certainly I think you were right to keep the levels short and sweet since they are there mostly to frame the story.
Anyway, it left a real impression. Thanks!