>>321476632
Specifically over the last year and a half? Alyx, Boneworks, Saints & Sinners, and Pistol Whip. Squadrons too if you're interested in space dogfighting and Star Wars physics don't bother you. Blade and Sorcery also got some updates and Until You Fall got out of early access, so those might be worth another look if you'd passed on them before.
I've also heard really good things about Project Wingman, but haven't picked it up yet, and Asgard's Wrath is supposed to be pretty good as far as Rift exclusives go.