Games like Nocturnal Whispers
Games like Nocturnal Whispers include Cyber Manhunt, The Operator, Blue Prince, Her Story, and Unheard - Voices of Crime. We matched them by the tags players give Nocturnal Whispers on Steam (Simulation, Interactive Fiction, Puzzle, Immersive Sim, and FMV): closest matches first, and among equally close ones the better-known games.

Cyber Manhunt
Shared: Simulation · Puzzle · Mystery

The Operator
Shared: Puzzle · Simulation · Immersive Sim

Blue Prince
Shared: Puzzle · Mystery · Investigation

Her Story
Shared: Interactive Fiction · Puzzle · Investigation

Unheard - Voices of Crime
Shared: Puzzle · Mystery · Simulation

Papers, Please
Shared: Simulation · Indie · Puzzle

No Case Should Remain Unsolved
Shared: Interactive Fiction · Puzzle · Investigation

The Case of the Golden Idol
Shared: Puzzle · Mystery · Investigation

Breakout 13
Shared: Interactive Fiction · FMV · Immersive Sim

Vanity Fair: The Pursuit
Shared: FMV · Simulation · Immersive Sim

Strange Horticulture
Shared: Puzzle · Mystery · Simulation

Mandate Of Heaven
Shared: Simulation · FMV · Puzzle

Orwell: Keeping an Eye On You
Shared: Simulation · Investigation · Interactive Fiction

Love is All Around 2
Shared: Interactive Fiction · FMV · Simulation

The Test
Shared: Simulation · Psychological · Story Rich

The Roottrees are Dead
Shared: Puzzle · Mystery · Investigation

Desktop Explorer
Shared: Puzzle · Simulation · Interactive Fiction

Lost Wiki: Kozlovka
Shared: Mystery · Puzzle · Interactive Fiction

Killer Frequency
Shared: Puzzle · Interactive Fiction · Simulation

Telling Lies
Shared: FMV · Mystery · Interactive Fiction

Return of the Obra Dinn
Shared: Puzzle · Mystery · Story Rich

Love Is All Around
Shared: FMV · Interactive Fiction · Immersive Sim

Murders on the Yangtze River
Shared: Puzzle · Mystery · Indie

Cyber Manhunt 2: New World - The Hacking Simulator
Shared: Puzzle · Mystery · Investigation