Click the green flag twice. The crab will travel to your mouse. Eat apples that are smaller than you to gain mass. Avoid sharks unless you are bigger than them. Get Gobos if you are bigger than them to get 25 percent more mass. Eat octopi. They are bosses. Screen zooms out when you get a certain amount of size.
pictures by Scratch. There is a cheat code too. Sometimes stops moving for no reason (I don't know why).