
Just because Shigeru Miyamoto tends to make happy, sunhine-y games, that doesn't mean there aren't social issues that concern him. In an interview with Entertainment Weekly, the Mario creator said that if he was going to design a game that addressed a real-world issue, it might be one that taught kids and young adults to respect their elders, or perhaps taught social responsibility, like the need to pay taxes.
He also pondered why Twilight Princess is not selling particularly well in Japan:
To be honest, I did find Twilight Princess to be a bit too enormous. Between hunting down Poes, finding heart pieces, catching bugs, and progressing through the actual storyline, it can be a bit exhausting. Doesn't mean it isn't an amazing game, of course, but has the time come to make a smaller Zelda?
The Man Who Made "Mario" Super [Entertainment Weekly]