Mobile, PC, and console all at once, as I recall. They really marketed the crap out of it and were on the necessary platforms to capitalize on it, too.

And with a game that had not only polished content, but plenty of it at launch.

I'm sure I'll get a lot of hate for bringing this up, but it's also worth noting that they definitely rode on the coattails of Zelda's success. So much of that game's identity is lifted wholesale from Breath of the Wild that it can almost be hard to tell the two apart in side-by-side screenshots. Again, none of this is particularly bad, but it definitely contributed to it's meteoric popularity.

Other than being cell-shaded, I've never understood the comparisons...

But I absolutely remember tons of people saying how alike they were, so I think you're correct about them riding its coat-tails.