I know I've started a bunch of games. I think I've only finished 3.
Mario + Rabbids (Switch)
Castlevania: Bloodlines (Genesis)
Grim Fandango (PC)
I remember also beating these games:
Sonic the Hedgehog (Genesis)
Rocket Knight Adventures (Genesis)
Dragon Quest Builders (Switch)
Axiom Verge (Switch)
Super Mario Odyssey (Switch)
Octopath Traveler (Switch)
Dark Souls 3 (PS4)
I feel like I had a couple more, but can't remember them off the top of my head. I wouldn't have remembered the three games I'd quoted if I hadn't already put them in this thread.