The slime is in a lab being tested, all the slime wants is the ice-cream at the end of the test so that’s your goal. To solve the puzzles you have to merge with objects to get their properties and in this way you can get through the obstacles to complete the stage.

The Good, the Bad, and the Veggie
Commander Greenstick’s latest assignment is his toughest yet: on the primitive planet of Earth, a crop of his bretheren have achieved sentience mere days before