Breath of the Wild for the fact that even if it's a seemingly "aimless" game it's fun just wandering around what remains of the former kingdom of Hyrule where you're not really hard pressed to finish the game immediately and get to chill and interact with all these other npcs and colorful characters exploring the same as you are (albeit with very different motivations)
Splatoon is another game I hold in decent regard coz even for it's connection issues and ocassionaly quite difficult story mode stages (looking at you splatoon 3 target challenge levels + after alterna) it's still really fun plus it's not always competitive so there's nothing stopping you and your teammates from just goofing around and partying with the other team
Sonic Colors also lands on the list for me coz aside from having really cool level design and good music it's also just really fun to play~ plus stopping and sitting around to listen to Eggman's occasional PA announcements is funny (just wonder who was bold enough to break into his egg mobile )
Undertale definitely falls in line too coz even if i didn't replay it very often (something about it almost made me feel guilty especially after true pacifist) but it was both really memorable and a lot of fun. Deltarune too though I've gotta give it a proper play through but it's been fun so far
omg and the Portal games!!! lol
I'm also hoping to add Sonic Frontiers to the list coz even tho I've only played the demo it's honestly really satisfying to play (as well as OneShot and Ib coz i've only ever watched playthroughs of those than getting to go though and experience them myself)