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After beating level 15, the ending of Space Hopper will appear. It shows a black hole behind the astronaut with him standing on a planet with a pink astronaut (who could be his girlfriend) in front of him. Some dome-shaped houses with blue circular windows are seen to the right of the pink astronaut. On the top of the screen are the words "Congratulations! You made it home!"
Electric planets are big and covered with metal. After a few second they will make their surface of them covered with blue electricity. A well timed jump will allow the Astronaut to not take damage from the electricity.
Hot planets are the most dangerous planet encountered. They have a black crust on them that allows safe travel around them. But in between the black crust is harmful red liquid. Sometimes there is small parts of the black crust that is between large parts of liquid.
Ice planets have a slippery surface that causes the Astronaut to move slowly in one direction but will soon speed up over time.