Turning the screen with the thrid boss wasn't so bad in itself, but the shift didn't apply to the controls so the level rotated out under me and made moving very hazardous since you could never be sure that the direction you press to move applies at the time you do, and give how the boss seems to attack on the playfield as well, there wasn't really a chance to wait for moving...
It took me a while to discover the "stretch" option...