This came from a Interview with Dylan Cuthbert, (founder of Q Games, he worked at Nintendo and seems like he married Miyamoto's daugther) Yep Miyamoto himself pulled the trigger in a finished game:
Miyamoto doesn't have any qualms about canceling games, something Cuthbert found out firsthand after the Nintendo designer canned the sequel to Star Fox. The first Star Fox game was a smash hit, and the sequel seemed poised to be a big hit, too. But with the upcoming N64 console on the horizon and rival Sony releasing the PlayStation 1, Miyamoto decided to cancel the finished game.
"The thinking was that if Nintendo released another 3D game on the Super Nintendo," said Cuthbert, "then it would be compared with the PlayStation 1, and the quality was completely different." Miyamoto came and told the team that the completed game would not be released. "Star Fox 2 was disappointing but I could understand the reasoning—the PlayStation and Saturn had come out and were obviously superior to the SuperFX chip," said Cuthbert. "Considering the rivalry between Sony and Nintendo I could see exactly where they were coming from." The two consoles would have been unfairly compared.
http://kotaku.com/#!5794333/the-kid-who-trained-with-the-masters-of-nintendo-during-a-gaming-golden-age
Se yes, at some dark place in Nintendo building/ warehouse/bunker or whatever they use there's a brand new SNES game that was never released
