Games like Ultreïa
Games like Ultreïa include Gorogoa, The Room, Papers, Please, Chants of Sennaar, and Rusty Lake Paradise. We matched them by the tags players give Ultreïa on Steam (Puzzle, Point & Click, Post-apocalyptic, 2D, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Gorogoa
Shared: Puzzle · Point & Click · Atmospheric

The Room
Shared: Puzzle · Point & Click · Atmospheric

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

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

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

GRIS
Shared: Atmospheric · Adventure · Beautiful

FAR: Lone Sails
Shared: Post-apocalyptic · Atmospheric · Adventure

The Mr. Rabbit Magic Show
Shared: Point & Click · Puzzle · Adventure

The Dark Eye: Memoria
Shared: Point & Click · Puzzle · Adventure

Servant of the Lake
Shared: Puzzle · Point & Click · Adventure

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

Samsara Room
Shared: Puzzle · Point & Click · Adventure

Thimbleweed Park™
Shared: Point & Click · Puzzle · Adventure

The Room Two
Shared: Puzzle · Point & Click · Atmospheric

The Night of the Rabbit
Shared: Point & Click · Puzzle · Adventure

Deponia
Shared: Point & Click · Puzzle · Adventure

A New Beginning: Final Cut
Shared: Point & Click · Puzzle · Adventure

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

Fran Bow
Shared: Point & Click · Puzzle · Adventure

LIMBO
Shared: Puzzle · Atmospheric · 2D

Machinarium
Shared: Puzzle · Point & Click · 2D

Stray
Shared: Atmospheric · Adventure · Puzzle

The Curse of Monkey Island
Shared: Point & Click · Puzzle · Adventure

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