Flower, Journey, Pixeljunk Eden.
Lara Croft Go. Pretty chill puzzle game.
The Sam And Max games. Most point and click games. Monkey Island games is another series I enjoyed.
There's probably some better examples I'm missing. Now, a couple of honorable mentions that maybe, maybe don't quite fit as well into the chill category.
I'm finding Megadimension Neptunia V II to be pretty chill in terms of gameplay, and it's very upbeat an lighthearted in terms of dialogue, but keeping my "routes" organized for my playthroughs is a bit daunting. I already screwed up some things in my first run.
- "If you have the heart of a true winner, you can always get more pissed off than some other asshole."