Games like Star Sky 2
Games like Star Sky 2 include Journey, Firewatch, [Chillas Art] The Convenience Store, GRIS, and Game Dev Tycoon. We matched them by the tags players give Star Sky 2 on Steam (Casual, Adventure, Indie, Simulation, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Journey
Shared: Adventure · Indie · Atmospheric

Firewatch
Shared: Adventure · Atmospheric · Walking Simulator

[Chillas Art] The Convenience Store
Shared: Indie · Adventure · Casual

GRIS
Shared: Indie · Adventure · Atmospheric

Game Dev Tycoon
Shared: Indie · Simulation · Casual

Banana
Shared: Casual · 2D · Simulation

Papers, Please
Shared: Indie · Simulation · Atmospheric

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

Home Behind
Shared: Adventure · Casual · Indie

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

Sparkle 2 Evo
Shared: Casual · Indie · Simulation

Star Sky
Shared: Casual · Adventure · Indie

Wobbly Life
Shared: Adventure · Simulation · Casual

Plague Inc: Evolved
Shared: Simulation · Indie · Casual

Russian Life Simulator
Shared: Simulation · Indie · 2D

The Beginner's Guide
Shared: Indie · Walking Simulator · Atmospheric

Pikuniku
Shared: Adventure · Casual · Indie

DAVE THE DIVER
Shared: Casual · Adventure · Simulation

Gorogoa
Shared: Indie · Casual · Atmospheric

Chained Together
Shared: Adventure · Casual · Simulation

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Adventure

LIMBO
Shared: Indie · Adventure · Atmospheric

ABZU
Shared: Adventure · Atmospheric · Casual

Everybody's Gone to the Rapture
Shared: Indie · Walking Simulator · Adventure