Pillars of Eternity is supposed to be really good, if you like your old school Baldurs Gate style RPGs. Made by Obsidian who made Star Wars Knights of the Old Republic II, Neverwinter Nights 2, Alpha Protocol, Fallout: New Vegas and more. I own a copy already, but I’ve never installed it. I wish I had the time for a game like that these days.
From the Bamsters list Undertale is beloved by many. 2D turn based type game that subverts the genre with interesting non-lethal approaches and a supposedly excellent story. Again, I haven’t played it myself though.