Games like Innsmouth Nightmare
Games like Innsmouth Nightmare include Tiny Bunny, DISTRAINT: Deluxe Edition, LIMBO, Five Nights at Freddy's: Into the Pit, and The Rewinder. We matched them by the tags players give Innsmouth Nightmare on Steam (2D, Dark, Singleplayer, Visual Novel, and Side Scroller): closest matches first, and among equally close ones the better-known games.

Tiny Bunny
Shared: Visual Novel · Dark · Singleplayer

DISTRAINT: Deluxe Edition
Shared: 2D · Adventure · Singleplayer

LIMBO
Shared: Dark · 2D · Singleplayer

Five Nights at Freddy's: Into the Pit
Shared: 2D · Singleplayer · Adventure

The Rewinder
Shared: Adventure · Singleplayer · 2D

SANABI
Shared: 2D · Singleplayer · Pixel Graphics

Urban Myth Dissolution Center
Shared: Visual Novel · 2D · Singleplayer

Sally Face - Episode One
Shared: Dark · Adventure · Singleplayer

Until Then
Shared: Visual Novel · 2D · Pixel Graphics

Papers, Please
Shared: Singleplayer · Pixel Graphics · Point & Click

Finding Paradise
Shared: 2D · Adventure · Singleplayer

Higurashi When They Cry Hou - Ch.1 Onikakushi
Shared: Visual Novel · Dark · Singleplayer

Fran Bow
Shared: Dark · Adventure · Singleplayer

The Deed
Shared: Adventure · Visual Novel · Singleplayer

Impostor Factory
Shared: 2D · Adventure · Singleplayer

The Red Strings Club
Shared: Pixel Graphics · Adventure · Singleplayer

The Silent Age
Shared: Side Scroller · Adventure · Point & Click

Look Outside
Shared: 2D · Pixel Graphics · Lovecraftian

The Room Three
Shared: Adventure · Singleplayer · Dark

OneShot
Shared: Singleplayer · Pixel Graphics · 2D

Little Nightmares
Shared: Singleplayer · Dark · Adventure

Eastward
Shared: Singleplayer · Adventure · Pixel Graphics

Hellblade: Senua's Sacrifice
Shared: Singleplayer · Dark · Atmospheric

The Crown of Leaves
Shared: Visual Novel · Adventure · 2D