This controller gamemode would map your analog stick location on screen and partition the resulting circle into sections(perhaps more partitions would mean higher difficulty). Then the player would have to move the joystick close to the edge of a section to match up with a beatmap based rendition on the other side. After matching the location with the beatmap rendition, location the beatmap would perhaps glow a different color and you would have to press the matching color button(or maybe even a symbol for colorblind people) which would bring in the next circle.