Games like Alter Ego
Games like Alter Ego include The Room, Murdered: Soul Suspect, The Room Two, The Rewinder, and The Room Three. We matched them by the tags players give Alter Ego on Steam (Adventure, Point & Click, Mystery, Detective, and Atmospheric): closest matches first, and among equally close ones the better-known games.

The Room
Shared: Point & Click · Mystery · Adventure

Murdered: Soul Suspect
Shared: Adventure · Detective · Mystery

The Room Two
Shared: Point & Click · Mystery · Adventure

The Rewinder
Shared: Adventure · Mystery · Detective

The Room Three
Shared: Adventure · Mystery · Point & Click

Sherlock Holmes: Crimes and Punishments
Shared: Adventure · Detective · Mystery

Firewatch
Shared: Adventure · Atmospheric · Mystery

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

The Room 4: Old Sins
Shared: Point & Click · Mystery · Adventure

Return of the Obra Dinn
Shared: Mystery · Detective · Atmospheric

Cube Escape Collection
Shared: Point & Click · Mystery · Horror

Sherlock Holmes: The Devil's Daughter
Shared: Adventure · Detective · Mystery

The White Door
Shared: Adventure · Point & Click · Detective

Danganronpa: Trigger Happy Havoc
Shared: Mystery · Detective · Adventure

Danganronpa 2: Goodbye Despair
Shared: Detective · Mystery · Adventure

Return to Shironagasu Island
Shared: Adventure · Mystery · Detective

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

The Roottrees are Dead
Shared: Detective · Mystery · Point & Click

Strange Horticulture
Shared: Mystery · Detective · Point & Click

The Vanishing of Ethan Carter
Shared: Mystery · Detective · Atmospheric

The Walking Dead
Shared: Adventure · Point & Click · Singleplayer

Stray
Shared: Adventure · Atmospheric · Singleplayer

The Wolf Among Us
Shared: Adventure · Detective · Point & Click

Sally Face - Episode One
Shared: Adventure · Horror · Mystery