A Boy and His Blob consists of two parts: wandering around caves collecting treasure, and wandering around an alien planet trying to avoid killer candy and treats. You can go to the planet pretty well any time you want to, but if you haven't gotten the bonus bag of jellybeans from the cave network you don't have the necessary items to finish the game. Tricky.
The problem with the Blob's home planet, though, is that everything's super-deadly and real tough to avoid, mainly because of the boy's particularly loose controls.
But he has a secret weapon.
On the first screen when you land on Blobolonia, start chucking jellybeans toward the left side of the screen.
It's kind of hard to get the timing right, but you kind of want to throw the bean right when you touch the edge of the screen. If you do it right, you'll briefly catch a glimpse off the last boss room. Once that happens, all of the enemies on the entire planet (except for the boss himself) will vanish.
Which makes that part pretty much as easy as it can be.