To be clear, I have completed the level. I know how the player escapes the final level of the egypt set, The Top. But I don't see how punching in the constellation buttons allows the characters to leave. After doing the level 3 times, I can't see anything change in the level when the victory dance begins to play.
Although since this particular level is open-air, it's believable that the characters just left... But if that's the answer, there would be no justification to solving the puzzles here.

Hey Bulbo!

Hmm... Maybe they got ported out to a new planet? Or to a spaceship?