Games like EXOTIUM - Episode 1
Games like EXOTIUM - Episode 1 include Mirror 2: Project X, Florence, Before Your Eyes, Mixtape, and Bloons TD 6. We matched them by the tags players give EXOTIUM - Episode 1 on Steam (Walking Simulator, Singleplayer, Casual, Interactive Fiction, and Solitaire): closest matches first, and among equally close ones the better-known games.

Mirror 2: Project X
Shared: 3D · Singleplayer · Interactive Fiction

Florence
Shared: Casual · Indie · Singleplayer

Before Your Eyes
Shared: Singleplayer · Walking Simulator · Interactive Fiction

Mixtape
Shared: Walking Simulator · Singleplayer · Casual

Bloons TD 6
Shared: Singleplayer · Casual · 3D

Donut County
Shared: Casual · Indie · Singleplayer

Firewatch
Shared: Walking Simulator · Singleplayer · Indie

The Beginner's Guide
Shared: Walking Simulator · Singleplayer · Indie

To the Moon
Shared: Singleplayer · Indie · Interactive Fiction

Road 96: Mile 0
Shared: Walking Simulator · Interactive Fiction · 3D

MUSYNX
Shared: Singleplayer · Casual · Indie

Moncage
Shared: Casual · Singleplayer · Indie

Baby Steps
Shared: Walking Simulator · Casual · Singleplayer

The Stanley Parable
Shared: Walking Simulator · Indie · Singleplayer

Gorogoa
Shared: Singleplayer · Casual · Indie

A Bird Story
Shared: Indie · Singleplayer · Interactive Fiction

Gone Home
Shared: Walking Simulator · Indie · Singleplayer

Game Dev Tycoon
Shared: Casual · Singleplayer · Indie

There Is No Game: Wrong Dimension
Shared: Indie · Casual · Singleplayer

Little Inferno
Shared: Casual · Singleplayer · Indie

Sizeable
Shared: Casual · Singleplayer · Indie

Doll Impostor
Shared: Walking Simulator · 3D · Singleplayer

Plague Inc: Evolved
Shared: Singleplayer · Indie · Casual

Poker Night at the Inventory
Shared: Casual · Singleplayer · 3D