Got the Gold Trophy. How: I ate everything in the credits to the last screen with the Egg. Ate everything except the egg and put the controller down - walked away. The worm-fish snakes around the screen and passes through the egg but doesn't eat it. After a half-hour - Ding! Gold trophy.
Trying to sail through levels without eating anything or getting hurt has yet to get me any of the three silvers. Not sure what I'm not doing. O'ell.