This is absolute genius. This is exactly where games need to go- explore the unexplored! I love this concept, and the levels are absolutely gorgeous. Being able to explore fractals with no level bounds is a blast.
I have one major suggestion- Either have a multiple-goal system ( ie, gems from 'Marble Blast' ) that insentivizes players to explore more of the fractals, or make use of the vertical nature of some of these structures more. I'd love to see what could be done with a jump-button, or additional platforms added in to allow further exploration.