Yes, the whole planet, his for the molding! But what was he to do? The possibilities were practically limitless, and his imagination was already flying forward at a multi million miles an hour. Turn everyone into clowns? Make humans and animals swap roles? Remove one gender entirely?
He looked at his room, gazing at the posters of classic cartoon characters and sketches of his own. From oldies like Mickey Mouse, Bugs Bunny, Betty Boop, and Felix the Cat, to contemporaries like Adventure Time, Gravity Falls, and Cuphead, and even anime like Dragon Ball, My Hero Academia, and Kill la Kill. He had always loved cartoons from a very young age, and had often dreamed of bringing his own creations to life. It dawned on him then exactly what he was about to do.
Turning back to the Chronivac, he typed away fervently as he fleshed out exactly the world he wanted to live in. A world as real as the old, but much brighter, sillier, lighter... animated-er. Everything would look as though it were drawn on a digital pen and paper, and animated as smoothly as a theatrical release. Everyone's most defining traits would be exaggerated in a world resembling the rubber-hose toons of yore. People could look like anything from "regular" humans to cartoon animal people to anthropomorphic kitchenware. The logic and physics would operate under a believable form of the "anything goes" philosophy of cartoons. You could walk over a wide, deep hole in the ground so long as you didn't look down. You could end up anywhere at all if you forget to take that left turn at Albuquerque. You could pull anything you wanted out of your pocket so long as you put it in there, anything from hammers and anvils to sandwiches and cream pies. Everyone would love to make each other laugh and get into loony tune situations, but with a realistic-lite edge. Sex would still be a thing and would operate under unlimited porn physics, meaning that anything would stretch and fit and it wouldn't hurt unless you wanted it to. Sex was also made to be more open and accepted, as it was natural after all.
The computer extrapolated from his inputs pretty well, filling in some of the gaps with appropriate details. Satisfied, Jeff set the world to "Retroactive Rewrite", set everyone to be unaware that anything has changed except for him. With a hit of the "EXECUTE" command, Jeff sat back and watched his world transform.