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...
Most things only harm Pancho's balloons, so don't be scared to let him take a few hits.
Some advanced levels require seesaw physics, so remove the bits of wood that don't fit such a mechanism.
You can win a level on just one balloon.