Huh? I don't understand the people who claim that Ori isn't a '2d game' - Like, what? Asset wise, it's like 99% hand painted assets and the 1% is 3d characters. Comparing that to 2d fighting games where every asset is actually a 3d object is pretty crazy. Ori and the Will of the Wisps uses basically the same technique that games like Shovel Knight, Hollow Knight, Cuphead, etc. also use, except that we also put a decade of knowledge into it like our rendering system, the shader pipeline, etc. - but ultimately, we laid out hand-painted textures on flat planes in a 3d world, just like everyone else who's making 2d games nowadays.
If you wanna be strict about it, almost no game out there is a sprite-engine game anymore, cause it wouldn't make sense given current hardware.