Games like Star Sky 3
Games like Star Sky 3 include GRIS, Brothers - A Tale of Two Sons, Journey, Gorogoa, and Home Behind. We matched them by the tags players give Star Sky 3 on Steam (Adventure, Indie, Casual, Simulation, and Singleplayer): closest matches first, and among equally close ones the better-known games.

GRIS
Shared: Indie · Adventure · Beautiful

Brothers - A Tale of Two Sons
Shared: Adventure · Indie · Atmospheric

Journey
Shared: Adventure · Indie · Beautiful

Gorogoa
Shared: Indie · Singleplayer · Casual

Home Behind
Shared: Adventure · Indie · Casual

That's not my Neighbor
Shared: Adventure · Casual · Indie

Papers, Please
Shared: Indie · Simulation · Singleplayer

Hollow Knight: Silksong
Shared: Indie · Singleplayer · Adventure

ABZU
Shared: Adventure · Casual · Atmospheric

911 Operator
Shared: Simulation · Indie · Singleplayer

Stray
Shared: Adventure · Singleplayer · Atmospheric

LIMBO
Shared: Indie · Adventure · Singleplayer

Game Dev Tycoon
Shared: Indie · Simulation · Casual

Sparkle 2 Evo
Shared: Indie · Casual · Simulation

Star Sky
Shared: Indie · Adventure · Casual

Mountain
Shared: Indie · Simulation · Casual

Plague Inc: Evolved
Shared: Indie · Simulation · Singleplayer

Emily is Away <3
Shared: Indie · Simulation · Casual

Melvor Idle
Shared: Casual · Indie · Adventure

Florence
Shared: Indie · Adventure · Casual

Slime Rancher
Shared: Adventure · Singleplayer · Simulation

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Casual

Ori and the Will of the Wisps
Shared: Adventure · Beautiful · Singleplayer

DAVE THE DIVER
Shared: Adventure · Casual · Singleplayer