Games like Infinite sky
Games like Infinite sky include Spirit of the North, Ratchet & Clank: Rift Apart, Grow Home, Chained Together, and Kao the Kangaroo: Round 2 (2003 re-release). We matched them by the tags players give Infinite sky on Steam (Casual, Space Sim, 3D Platformer, Third Person, and Futuristic): closest matches first, and among equally close ones the better-known games.

Spirit of the North
Shared: Casual · Singleplayer · 3D Platformer

Ratchet & Clank: Rift Apart
Shared: 3D Platformer · Third Person · Singleplayer

Grow Home
Shared: 3D Platformer · Casual · Singleplayer

Chained Together
Shared: Casual · 3D Platformer · Third Person

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: 3D Platformer · Casual · Singleplayer

SpaceEngine
Shared: Casual · Space Sim · Futuristic

Caravan SandWitch
Shared: Singleplayer · 3D Platformer · Casual

Sonic Frontiers
Shared: 3D Platformer · Singleplayer · Third Person

SpongeBob SquarePants: Battle for Bikini Bottom - Rehydrated
Shared: 3D Platformer · Casual · Singleplayer

ALTF4
Shared: 3D Platformer · Third Person · Casual

Pumpkin Jack
Shared: 3D Platformer · Third Person · Singleplayer

Sonic Adventure 2
Shared: 3D Platformer · Third Person · Singleplayer

Pseudoregalia
Shared: 3D Platformer · Third Person · Singleplayer

Sonic Adventure DX
Shared: 3D Platformer · Singleplayer · Third Person

Marvel’s Spider-Man Remastered
Shared: Singleplayer · Third Person · Casual

Only Up: With Friends
Shared: Casual · 3D Platformer · Third Person

Spyro™ Reignited Trilogy
Shared: 3D Platformer · Singleplayer · Casual

Monument Valley
Shared: Casual · Singleplayer · Third Person

Refunct
Shared: 3D Platformer · Casual · Singleplayer

Detroit: Become Human
Shared: Singleplayer · Futuristic · Third Person

Psychonauts 2
Shared: 3D Platformer · Singleplayer · Third Person

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer

DAVE THE DIVER
Shared: Casual · Singleplayer

Ryse: Son of Rome
Shared: Third Person · Singleplayer · Linear