Games like Behind The Curtain
Games like Behind The Curtain include Sally Face - Episode One, No, I'm not a Human, Firework, Strange Horticulture, and LIMBO. We matched them by the tags players give Behind The Curtain on Steam (Dark, Atmospheric, Puzzle, Time Management, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Sally Face - Episode One
Shared: Dark · Puzzle · Atmospheric

No, I'm not a Human
Shared: Choices Matter · Atmospheric · Dark

Firework
Shared: Puzzle · Atmospheric · Indie

Strange Horticulture
Shared: Puzzle · Dark · Atmospheric

LIMBO
Shared: Puzzle · Dark · Atmospheric

INSIDE
Shared: Atmospheric · Dark · Puzzle

The Room Three
Shared: Puzzle · Atmospheric · Mystery

Poppy Playtime
Shared: Puzzle · Dark · Singleplayer

OneShot
Shared: Atmospheric · Puzzle · Indie

The Room
Shared: Puzzle · Atmospheric · Mystery

Beholder
Shared: Atmospheric · Choices Matter · Dark

Oxenfree
Shared: Atmospheric · Choices Matter · Supernatural

The Room Two
Shared: Puzzle · Atmospheric · Mystery

Little Nightmares
Shared: Atmospheric · Dark · Puzzle

Return of the Obra Dinn
Shared: Puzzle · Atmospheric · Mystery

Seen
Shared: Dark · Puzzle · Atmospheric

Little Nightmares II
Shared: Dark · Puzzle · Atmospheric

The Séance of Blake Manor
Shared: Puzzle · Atmospheric · Supernatural

Papers, Please
Shared: Puzzle · Multiple Endings · Indie

Gorogoa
Shared: Puzzle · Atmospheric · Indie

Undertale
Shared: Multiple Endings · Choices Matter · Singleplayer

Strange Antiquities
Shared: Puzzle · Dark · Atmospheric

Chants of Sennaar
Shared: Puzzle · Atmospheric · Singleplayer

Bendy and the Ink Machine
Shared: Puzzle · Dark · Singleplayer