Games like Northern Lights
Games like Northern Lights include Little Nightmares, Seen, Little Nightmares II, LIMBO, and Deliver Us The Moon. We matched them by the tags players give Northern Lights on Steam (Action, Adventure, Indie, Puzzle, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Little Nightmares
Shared: Adventure · Singleplayer · Puzzle

Seen
Shared: Indie · Adventure · Singleplayer

Little Nightmares II
Shared: Adventure · Puzzle · Singleplayer

LIMBO
Shared: Indie · Puzzle · Adventure

Deliver Us The Moon
Shared: Adventure · Action · Indie

INSIDE
Shared: Indie · Atmospheric · Adventure

FAR: Lone Sails
Shared: Adventure · Singleplayer · Indie

Firewatch
Shared: Adventure · Atmospheric · Singleplayer

The Room
Shared: Puzzle · Adventure · Singleplayer

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

Stray
Shared: Adventure · Singleplayer · Atmospheric

Poppy Playtime
Shared: Singleplayer · Puzzle · Indie

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

Half-Life 2
Shared: Action · Singleplayer · Sci-fi

ROUTINE
Shared: Singleplayer · Sci-fi · Adventure

The Room Two
Shared: Puzzle · Adventure · Indie

Among the Sleep - Enhanced Edition
Shared: Indie · Adventure · Singleplayer

Sally Face - Episode One
Shared: Indie · Adventure · Puzzle

DARQ: Complete Edition
Shared: Adventure · Puzzle · Singleplayer

The Room Three
Shared: Adventure · Puzzle · Indie

SOMA
Shared: Sci-fi · Atmospheric · Dark

Outer Wilds
Shared: Adventure · Puzzle · Indie

The Fall
Shared: Adventure · Indie · Action

Bendy and the Dark Revival
Shared: Action · Singleplayer · Adventure