The showrunner also claimed that he got no "actual feedback" from viewers that the show had become too complicated.
Moffat did acknowledge that the criticism existed among fans, but claimed that none of it came from children who watched the show, which satisfied him.
"It's demanding television, but isn't that something to celebrate?" Moffat told Richard Bacon's BBC Radio 5 Live show.
"We are doing the opposite of dumbing down. Shouldn't that be celebrated and not criticised?"
Commenting on the subject of whether the BBC sci-fi series is a children's show or an adult drama, he joked: "Everyone by the end of the opening music is a kid!
"It is watched by more adults than kids, but there is something at its heart, which belongs to children.
"All the best stuff is children's. You look at a risotto on a menu and you see the children's menu and there's sausage and chips. All the good stuff belongs to children."
Doctor Who's new series starts soon on BBC One in the UK and BBC America in the US.
