I like your original zero-g movement mechanic. The level design seemed like a good balance of skill and puzzling. I found it a bit frustrating as the levels got more complicated though. There was a bit of input lag when trying to turn, and combined with the randomly changing speed it was very difficult to time corners effectively. That fits the theme of out of control, but made it a bit frustrating to play.
The congratulatory voice lines were a great touch too :)