Games like Isolomus
Games like Isolomus include Plug & Play, Sally Face - Episode One, Fran Bow, Samsara Room, and DISTRAINT: Deluxe Edition. We matched them by the tags players give Isolomus on Steam (Indie, Short, Psychological Horror, Casual, and Surreal): closest matches first, and among equally close ones the better-known games.

Plug & Play
Shared: Indie · Short · Casual

Sally Face - Episode One
Shared: Indie · Psychological Horror · Adventure

Fran Bow
Shared: Psychological Horror · Indie · Puzzle

Samsara Room
Shared: Indie · Adventure · Puzzle

DISTRAINT: Deluxe Edition
Shared: Indie · Psychological Horror · Adventure

The White Door
Shared: Indie · Psychological Horror · Adventure

The Room
Shared: Indie · Puzzle · Short

LIMBO
Shared: Indie · Puzzle · Adventure

Rusty Lake Paradise
Shared: Indie · Psychological Horror · Puzzle

Little Misfortune
Shared: Indie · Psychological Horror · Adventure

Gorogoa
Shared: Indie · Puzzle · Casual

The Room Two
Shared: Indie · Puzzle · Adventure

Little Inferno
Shared: Indie · Casual · Short

Rusty Lake Hotel
Shared: Indie · Psychological Horror · Puzzle

Little Nightmares
Shared: Indie · Adventure · Horror

Cube Escape Collection
Shared: Psychological Horror · Indie · Puzzle

Little Nightmares II
Shared: Adventure · Psychological Horror · Puzzle

Servant of the Lake
Shared: Indie · Adventure · Puzzle

Detention
Shared: Indie · Psychological Horror · Horror

Getting Over It with Bennett Foddy
Shared: Psychological Horror · Indie · Singleplayer

There Is No Game: Wrong Dimension
Shared: Indie · Puzzle · Adventure

The Room Three
Shared: Indie · Puzzle · Adventure

Poppy Playtime
Shared: Psychological Horror · Singleplayer · Puzzle

Firework
Shared: Indie · Psychological Horror · Puzzle