Like others said, magical atmosphere. Part of I'm sure is the sleep-walking movement, but after a few levels I wished I could speed things up a bit, especially if I had to sleep-walk 10 blocks in a row.
I enjoyed the scenery, the lighting. I feel it was a bit too much (for me!) when all the blocks glow back and forth, I guess after a while it got a bit too much.
The 'feeling' conveyed by the audio when you are nearing the blue orb is an amazing touch.
In any case - charming game, I loved it!