Tilting the device sent Pechan, the pink hero, left or right across the ground. The idea was to slide him towards a juicer, pushing it and the walking fruit in its way onto the sides of each level, squishing the fruit into lovely juice. Yes, juicing sentient fruit sounds a bit sadistic when you think about it, but it turns out to be just lovely and cuddly, especially when you have devs around you squealing "Pechan!" every time you beat a level.
And no, the game has nothing to do with the pig from Ranma 1/2.