Games like NightSky
Games like NightSky include LIMBO, Zup!, Zup! S, GRIS, and FEZ. We matched them by the tags players give NightSky on Steam (Puzzle Platformer, Indie, Platformer, Casual, and Puzzle): closest matches first, and among equally close ones the better-known games.

LIMBO
Shared: Puzzle Platformer · Indie · Platformer

Zup!
Shared: Indie · Casual · Puzzle

Zup! S
Shared: Indie · Casual · Puzzle

GRIS
Shared: Indie · Atmospheric · Platformer

FEZ
Shared: Platformer · Indie · Puzzle

Zup! F
Shared: Indie · Casual · Puzzle

Braid
Shared: Puzzle Platformer · Indie · Puzzle

Defy Gravity Extended
Shared: Puzzle Platformer · Indie · Platformer

Zup! 3
Shared: Indie · Casual · Puzzle

Zup! 2
Shared: Indie · Casual · Puzzle

Zup! X
Shared: Indie · Casual · Puzzle

Nihilumbra
Shared: Indie · Platformer · Puzzle Platformer

Zup! 8
Shared: Indie · Casual · Puzzle

Zup! Z
Shared: Indie · Puzzle · Casual

BEEP
Shared: Indie · Platformer · Physics

Little Nightmares
Shared: Puzzle Platformer · Atmospheric · Indie

Zup! 7
Shared: Indie · Casual · Puzzle

Zup! 5
Shared: Indie · Casual · Puzzle

Hollow Knight
Shared: Platformer · Indie · 2D

The Bridge
Shared: Puzzle Platformer · Physics · Puzzle

Portal 2
Shared: Platformer · Puzzle · Puzzle Platformer

World of Goo
Shared: Indie · Puzzle · Physics

Zup! 6
Shared: Indie · Casual · Puzzle

Shady Part of Me
Shared: Indie · Puzzle · Platformer