It also might help for you to know that I strive for perfect, no grays, nearly all color runs I say nearly all colors because getting them all would screw up a clean finish. Usually.
Everyone else: Dodge, collect blocks, sort blocks, look for powerups, worry about colors, oh crap, you're running out of space. Respawning....
It isn't that hard considering the blocks change with the intensity of the music, and unless you're just collecting at random there's really nothing to it.