Even W101 really is a kids game. Sure maybe the controls are more wonky, but the art style is specifically designed for elementary school children, the game designers even say so.
X, Bayonetta 2, and maybe SMT x Fire Emblem are the only three games Nintendo has in development that are expressly aimed at adults, that averages out to 1 whopping "game for adults" each year, and lets be honest X and Bayo 2 are likely to get little to no marketing support from Nintendo.