The sight of all those trucks piling up and just happily trucking into each other made me giggle. Nice memetastic gameover audio too!
As far as the adaptive music part i noticed the layering as the game progressed to higher stages.
One thing that was almost there was the tones being played when I picked up an orb. I could only ever get 5 at a time before the game would do a weird position reset and not let me finish the tune that was beginning.