Board Thread:Episode Discussions/@comment-25787298-20160519120227/@comment-734582-20160526081630

Lulcielid wrote: (he very likely might have received some warnings from Jump´s higher ups about how many chapter left until ending the manga around the time Kaguya debuted) It was Kishimoto who pushed for an ending, not Jump. If it was Jump's choice, we'd still be going. It seems Kishimoto aimed for 700 chapters and did what he had to do to get there.

As to Otsutsuki and Aliens, it seems he got inspired by other folklore about people from the moon (which seems to be more common than i initially thought) and so it evolved into that.

Kaguya IS based upon a princess-from-the-moon story.