Space itself is a obstacle for Bob-O, while the lack of gravity helps him traverse the moon and diffrent planet ls however he's subject to jumping too high and leaves out of orbit. Where the player has a chance to either lands on a previous level or sent straight to the sun for a game over.
Now that Bob-O is in space the Sun want him to be with it and increases it's gravitational pull whenver Bobo gets further on journey, dont fall into the sun or its game over.
Platforming is the main obstacle Bob-O must master. Or else space masters you.