Pseudoregalia is a PS1-eta low-poly aesthetic 3D metroidvania with really, really slick movement mechanics. It’s the kind of game that really could’ve existed back then, had developers just known all the little quality of life design choices we have these days.
You can patent a specific implementation of a technology, but not usually the principles behind that tech. Nintendo had patented this, too, but that likely has little to no effect on other hall effect joystick manufacturers.