Disclaimer: the theme of the game is not shown in the standard ending of the game, instead it's in the secret, to get the secret ending, ignore the mother's silver bell hunt, and go help dust bunny in back of the castle for the gold bell, play the jellyfish's race in the sky area and race up the structure and grab the lavender rose before he does.
play and win the silicon plant bros's shuffle game at the top of the tree stump in the silicon forest area, then head back into the castle for the secret ending.