Well of course I'm narrowing it down! It's super-easy for a game with 2D hand-drawn sprites to look 2D! But a game that's made with 3D polygons that looks hand-drawn? That's a real challenge!
Cuphead looks fantastic. When they can retain that look in a free roaming 3D environment I will be very happy.
JSFR and Jet Grind Radio both look pretty good. There are some cel-shaded racing games like Auto Modellista - which was supposedly pretty bad (I've never played it). There was also Fear Effect for the PS1, which was probably (correct me if I'm wrong) the only PS1 game to use cel-shaded graphics. I haven't played that game either, but I've heard good things about it.