Games like TRACE//5
Games like TRACE//5 include Poppy Playtime, Escape the Backrooms, Inside the Backrooms, Firework, and MiSide. We matched them by the tags players give TRACE//5 on Steam (Horror, Psychological Horror, Exploration, Puzzle, and Investigation): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · Psychological Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Exploration

Inside the Backrooms
Shared: Horror · Psychological Horror · Puzzle

Firework
Shared: Horror · Puzzle · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · 3D

The Exit 8
Shared: Exploration · Horror · Puzzle

Garten of Banban
Shared: Horror · Psychological Horror · Puzzle

Phasmophobia
Shared: Horror · Psychological Horror · Investigation

SOMA
Shared: Horror · Psychological Horror · Exploration

Little Nightmares II
Shared: Horror · Puzzle · Psychological Horror

Blue Prince
Shared: Puzzle · Exploration · Investigation

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

Buckshot Roulette
Shared: Horror · Indie · Singleplayer

Pony Island
Shared: Psychological Horror · Puzzle · Indie

Little Nightmares
Shared: Horror · Puzzle · Singleplayer

Fran Bow
Shared: Psychological Horror · Horror · Puzzle

In Sound Mind
Shared: Horror · Psychological Horror · Puzzle

Outer Wilds
Shared: Exploration · Puzzle · Horror

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

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

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Exploration

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

The Painscreek Killings
Shared: Investigation · Exploration · Horror

Shipwrecked 64
Shared: Horror · Psychological Horror · Puzzle