In all the talk of graphical downgrades no one seems much preoccupied with 'why?'. Why build something and then proceed to tear it down, piece by piece, in the hope that ever more diminished expectations about the final product won't be severe enough to...
Moving up a boost level will smash some of the obstacles on-screen.
Always try and grab power-ups when you can, for they're pretty darn useful.
Upgrading your armour will make your runs last a lot longer, but it's not cheap.