Games like Seashell
Games like Seashell include Flower, Chill with You : Lo-Fi Story, Librarian: Tidy Up the Arcane Library!, Placid Plastic Duck Simulator, and ABZU. We matched them by the tags players give Seashell on Steam (Relaxing, Nature, Atmospheric, Collectathon, and Music-Based Procedural Generation): closest matches first, and among equally close ones the better-known games.

Flower
Shared: Relaxing · Atmospheric · Nature

Chill with You : Lo-Fi Story
Shared: Relaxing · Atmospheric · Casual

Librarian: Tidy Up the Arcane Library!
Shared: Relaxing · Collectathon · Casual

Placid Plastic Duck Simulator
Shared: Relaxing · Collectathon · Casual

ABZU
Shared: Relaxing · Atmospheric · Casual

Terra Nil
Shared: Nature · Relaxing · Atmospheric

Slime Rancher 2
Shared: Relaxing · Colorful · Singleplayer

Ballads of Hongye: REBORN
Shared: Relaxing · Atmospheric · Nature

Adorable Adventures
Shared: Relaxing · Atmospheric · Casual

Equilinox
Shared: Relaxing · Nature · Casual

Submerged
Shared: Relaxing · Nature · Casual

Monument Valley 3
Shared: Relaxing · Atmospheric · Casual

Jalopy
Shared: Relaxing · Nature · Atmospheric

Unpacking
Shared: Relaxing · Casual · Singleplayer

Journey
Shared: Atmospheric · Relaxing · Casual

Mountain
Shared: Relaxing · Casual · Nature

My Little Puppy
Shared: Atmospheric · Colorful · Nature

SpaceEngine
Shared: Casual · 3D · Science

GRIS
Shared: Atmospheric · Relaxing · Indie

The First Tree
Shared: Atmospheric · Relaxing · Colorful

Samorost 1
Shared: Relaxing · Nature · Casual

Cloud Gardens
Shared: Nature · Relaxing · Atmospheric

Morphopolis
Shared: Casual · Colorful · Nature

Cozy Grove
Shared: Relaxing · Collectathon · Atmospheric