I formatted my choices a little differently (and I also couldn't narrow my choices to just one category), but:
Art Direction | Cuphead, Gris, Knights and Bikes, The Neverhood, Splatoon 2
Games as Art | Everything, Flower, LSD: Dream Simulator, Rez, Seaman
Innovative Game Mechanics | Boktai: The Sun is in Your Hands, Drill Dozer, Ring Fit Adventure, Tearaway, Vib-Ribbon
Quirky, Japanese | Chibi-Robo: Plug Into Adventure!, Chulip, Gitaroo Man, Godhand, We Love Katamari