It has recently emerged in an interview with the game’s creator, the one and only Suda51 said in an interview with Extra magazine (a MCV freebie):
“Originally, I’d wanted to make this game for Xbox 360, actually. Marvelous Interactive boss, Wada-san had information about the new Wii and how the new controller would work before it came out, so that’s why he thought I should produce the game on that format.
“At the time, I didn’t really understand why, but after seeing and understanding how it works, I think it was a good choice and the controller works really well with the game.”
With recent sales figure show a modest start of around 160,000 sold, he might just have wished he’d stuck with his original plan.