I would say Undertale...but then I played it XD
But seriously Undertale gets TOO much hype, it's almost toxic. And, in my opinion, Ubisoft IPs. For some reason, fans of Ubisoft games seem to outright refuse to accept the games aren't that good. Watch Dogs, Assassins Creed, Far Cry; all game franchises that receives massive amount of hype and are already on the sequel train (not too sure about Watchdogs, but I've heard it's being continued).
Ubisoft need to give these franchises a break...and then make Beyond Good and Evil 2! We've waited long enough! XD