Games like Lightout 2
Games like Lightout 2 include Poppy Playtime, Little Nightmares II, Outlast, Little Nightmares, and SOMA. We matched them by the tags players give Lightout 2 on Steam (Adventure, Horror, Puzzle, Atmospheric, and Thriller): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · Dark

Little Nightmares II
Shared: Adventure · Horror · Puzzle

Outlast
Shared: Horror · Atmospheric · Psychological Horror

Little Nightmares
Shared: Horror · Adventure · Atmospheric

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Amnesia: The Dark Descent
Shared: Horror · Atmospheric · Puzzle

Inside the Backrooms
Shared: Horror · Puzzle · Adventure

Sally Face - Episode One
Shared: Horror · Psychological Horror · Adventure

Darkwood
Shared: Horror · Adventure · Psychological Horror

Detention
Shared: Horror · Atmospheric · Puzzle

Outer Wilds
Shared: Adventure · Exploration · Atmospheric

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Atmospheric

The Room Two
Shared: Puzzle · Atmospheric · Horror

ROUTINE
Shared: Atmospheric · Adventure · Psychological Horror

The Forest
Shared: Horror · Adventure · Action

Garten of Banban
Shared: Horror · Puzzle · Psychological Horror

Fran Bow
Shared: Puzzle · Horror · Adventure

Layers of Fear (2016)
Shared: Horror · Atmospheric · Psychological Horror

MADiSON
Shared: Horror · Psychological Horror · Puzzle

Firework
Shared: Horror · Puzzle · Atmospheric

Resident Evil 7 Biohazard
Shared: Horror · Atmospheric · Psychological Horror

Outlast 2
Shared: Horror · Psychological Horror · Atmospheric

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

DARQ: Complete Edition
Shared: Horror · Adventure · Puzzle