Completed the second island. The crab boss was easier than the plant boss of the first island. Also found out the hard way in one of the second island's water levels to avoid big bubbles floating around as you get immobilized for an unknown amount of time and they are usually in the path of an enemy (so basically you touch a bubble, you lose a life). One usually sees a big bubble in underwater levels for a other games, and they think "AIR! SWEET AIR!", but not in this game. Though the fact you can't drown should have been a hint to me (or least I'm sure you don't need to worry about it as I didn't notice any difference in hunger gauge decrease when underwater)