Games like Insomnia: Theater in the Head
Games like Insomnia: Theater in the Head include Gorogoa, GRIS, Chants of Sennaar, Machinarium, and Papers, Please. We matched them by the tags players give Insomnia: Theater in the Head on Steam (Psychological, Point & Click, Hand-drawn, Stylized, and Indie): closest matches first, and among equally close ones the better-known games.

Gorogoa
Shared: Hand-drawn · Indie · Point & Click

GRIS
Shared: Indie · Hand-drawn · Atmospheric

Chants of Sennaar
Shared: Point & Click · Indie · Singleplayer

Machinarium
Shared: Point & Click · Hand-drawn · Atmospheric

Papers, Please
Shared: Point & Click · Indie · Singleplayer

Fran Bow
Shared: Point & Click · Indie · Psychological

Carto
Shared: Indie · Hand-drawn · Female Protagonist

Hellblade: Senua's Sacrifice
Shared: Psychological · Female Protagonist · Atmospheric

Old Man's Journey
Shared: Hand-drawn · Indie · Point & Click

Hollow Knight: Silksong
Shared: Indie · Singleplayer · Female Protagonist

Rusty Lake Paradise
Shared: Point & Click · Indie · Atmospheric

LUNA The Shadow Dust
Shared: Point & Click · Hand-drawn · Indie

There Is No Game: Wrong Dimension
Shared: Point & Click · Indie · Adventure

Edna & Harvey: The Breakout
Shared: Point & Click · Indie · Psychological

The Tiny Bang Story
Shared: Point & Click · Hand-drawn · Atmospheric

The Room
Shared: Point & Click · Atmospheric · Indie

Looking Up I See Only A Ceiling
Shared: Psychological · Point & Click · Atmospheric

Iris.Fall
Shared: Indie · Female Protagonist · Point & Click

Leila
Shared: Hand-drawn · Point & Click · Female Protagonist

Skullgirls 2nd Encore
Shared: Hand-drawn · Indie · Female Protagonist

Birth
Shared: Point & Click · Hand-drawn · Stylized

Hidden Folks
Shared: Hand-drawn · Point & Click · Indie

Pilgrims
Shared: Hand-drawn · Stylized · Point & Click

Lost in Play
Shared: Point & Click · Hand-drawn · 2D