On mouse & keyboard, the nested radial menus were awkward for me. It'd be nicer if I could cycle through categories & have a preview of what's available in said category on the screen somewhere and then choose what I want from a single radial menu, instead of having to navigate all the way to whatever it is I want from the root menu. But if you do stick with the nested radial menus a "back" option would be nice so it's easier to navigate between menus instead of having to restart from root each time I wanted to change categories.