Zelda and Chill

Pretty much all the night Animal Crossing music (Wild World in particular for me)

Beacon Pines (Spotify)

I didn't play it, but my wife and kid did, but the music really stood out to me when it was playing in the background. The tracks, Memories and Lullaby complement each other really well.

Sable (Spotify)

The soundtrack by Japanese Breakfast was one of the best parts of the game. A very solid mostly wordless ambient pop album. But the standout track is Glide. The song itself is fantastic but the moment it plays the game is so damn perfect. The whole soundtrack did an incredible job setting the tone for a slightly flawed but chill atmospheric adventure game.

Stardew Valley

C418's music (Minecraft vol. Alpha & Beta)

"Secunda" from the Skyrim OST

"Schala's Theme" from Chrono Trigger

Some songs of the Hotline Miami soundtrack

Not from a game, but absolutely fantastic:

"Promises" by Floating Points, Pharoah Sanders 🪦 and the London Symphony Orchestra

Oh and almost forgot: Til A Mermaid Drags You Under by Mary Lattimore is a must listen, just trust me on this one and don't skim through it.

Nier: Automata

There's a handful of frantic, battle music pieces in there so you might want to cull it to just the relaxing pieces, but I absolutely adore this soundtrack.

Stellaris OST

The music from Outer Wilds. Scintillating music for a sublime game. https://www.youtube.com/watch?v=9wSAWuhaJ4o

No one has mentioned Journey yet? Wowza.

Honorable mention for Abzu as well

Ff7 Tifa's theme

Fez soundtrack, by disasterpeace

Hollow Knight soundtrack done on piano is basically one epic chill track after another. Some are fast paced and more energetic though.

FTL sound track is also chill and amazing.

Same for the Ori soundtrack.

Honourable mentions: Axiom Verge and Sim City 3000

Animal Crossing New Leaf - 1AM

https://open.spotify.com/playlist/1yRkdeThrjNwOVRfa3UluW

Pokemon soundtrack.
So many great route and city tracks.

Final Fantasy IX - Melodies of Life

The underwater level music from both DKC and Mario 64.

Va from The Beginners Guide

Also this cover is even better

Yunas Sending from final fantasy x

Astro’s Playroom - SSD

The GPU song is also a banger but more energetic.

Back in the day when I played Anarchy Online 24/7, when it was time to sleep I used to travel to this area named Varmint Woods so I could sleep to the music and the ambience.

Shapez 2

The Sims 1 OST. Always makes me calm and happy.

• Chrono Trigger - Peaceful Days
• (And my favorite orchestral arrangement of it)
• Pilotwings 64 - Birdman
• Child of Light - Aurora's Theme

Aloy’s Theme

A Perfect Snowball - Spiral Knights OST

I really like this one from Ico titled Castle in The Mist: https://youtu.be/q9xroa4cMLM