Games like Noctambulant
Games like Noctambulant include Little Nightmares, Firework, OMORI, Sally Face - Episode One, and Amnesia: The Dark Descent. We matched them by the tags players give Noctambulant on Steam (Indie, Horror, Stealth, Survival Horror, and Puzzle): closest matches first, and among equally close ones the better-known games.

Little Nightmares
Shared: Horror · Atmospheric · Indie

Firework
Shared: Indie · Horror · Puzzle

OMORI
Shared: Indie · Horror · Psychological Horror

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

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

Mad Father
Shared: Horror · Survival Horror · Psychological Horror

Little Nightmares II
Shared: Horror · Puzzle · Atmospheric

Poppy Playtime
Shared: Horror · Puzzle · Survival Horror

Inside the Backrooms
Shared: Horror · Survival Horror · Puzzle

Detention
Shared: Indie · Horror · Puzzle

Fran Bow
Shared: Horror · Indie · Puzzle

SILENT HILL 2
Shared: Horror · Survival Horror · Atmospheric

DISTRAINT: Deluxe Edition
Shared: Indie · Horror · Psychological Horror

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Stealth

Outlast
Shared: Horror · Survival Horror · Atmospheric

The Count Lucanor
Shared: Horror · Survival Horror · Stealth

SOMA
Shared: Horror · Atmospheric · Survival Horror

Rusty Lake Paradise
Shared: Indie · Puzzle · Horror

SILENT HILL f
Shared: Horror · Survival Horror · Psychological Horror

Penumbra Overture
Shared: Horror · Indie · Survival Horror

GRIS
Shared: Indie · Atmospheric · Hand-drawn

No, I'm not a Human
Shared: Horror · Indie · Atmospheric

LIMBO
Shared: Indie · Puzzle · Atmospheric

Alien: Isolation
Shared: Horror · Survival Horror · Stealth