Well, some of my favorites are:
~The Elder Scrolls V: Skyrim (and the most of the mods for it are pretty cool, too.)
~Most games in the Sonic series, like Sonic 1, Sonic Mania, Sonic 2, etc. (except Sonic 06, which is just an atrocity).
~Shadow of the Colossus, specifically I really like the PS4 remake.
~Megaman
~Subnautica
~Portal, and Portal 2.
~I also really love all (or at least most of) the Legend of Zelda games. Ocarina of Time, Skyward Sword, Twilight Princess, The Minish Cap, A Link Between Worlds, and Majora's Mask are my favorite's, specifically.
~Most of the Pokemon games, though my favorites are specifically: FireRed, LeafGreen, HeartGold, Sun and Moon, Alpha Sapphire, and Platinum.
~Doki Doki Literature Club (Mainly because I like how it disguises itself as a typical romance, slice-life/dating sim type of game, and I just really like the story and the characters, which IMO, are all pretty interesting and give you a lot to think about, and I really like the horror aspect of the game, and I think it's pretty cool. Also, the mods are a plus, because they add a lot of cool things to the game).