Skullwaker on 24 June 2015
1. Splatoon was marketed a hell of a lot more
2. Splatoon is part of a more appealing genre (at least to the mainstream)
3. Splatoon, in terms of visuals, is generally more appealing to most people
4. Splatoon was reviewed much better
That's pretty much it. There was more demand for a new Nintendo shooter IP than there was for a new Western-styled SRPG.
