Just some chill serotonin games or stuff that just makes the world feel better. Many of these are building/farming games because that's what people generally use for that.
My girlfriend said it was the the one to start with
Costume Quest
EarthBound
Baba is You
Harvest Moon 64
Is this the good one? No idea
Sayonara Wild Hearts
Slime Rancher
Professor Layton and the Curious Village
Please assume this counts for the entire Professor Layton series
Paper Mario
Wattam
Paper Mario: The Thousand-Year Door
Ghost Trick: Phantom Detective
Much more serious than the other entries here. But it carries a fervent belief in fighting for a better future for your loved ones that I can't help but keep it on here.
Gravity Rush
Chibi-Robo!
Chulip
I hesitated to put this on good vibe serotonin because of just how frustrating the gameplay and mechanics and forward momentum can be, but its so darn charming it kinda beats that out.
Katamari Damacy
Mini Metro
Dr. Langeskov, The Tiger, and The Terribly Cursed Emerald: A Whirlwind Heist
80 Days
Nairi: Tower of Shirin
Wandersong
Quiplash
Include all Jackbox games tbh
Monster Prom
Its also horny, but like in a fun way instead of creepy.