Games like Nephise: Ascension
Games like Nephise: Ascension include Firewatch, What Remains of Edith Finch, Portal 2, GRIS, and The Witness. We matched them by the tags players give Nephise: Ascension on Steam (Adventure, Casual, Walking Simulator, First-Person, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · First-Person

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · First-Person

Portal 2
Shared: Singleplayer · First-Person · Platformer

GRIS
Shared: Adventure · Female Protagonist · Atmospheric

The Witness
Shared: First-Person · Puzzle · Singleplayer

The Room
Shared: Adventure · Puzzle · Singleplayer

A Story About My Uncle
Shared: Adventure · First-Person · Singleplayer

Call of the Sea
Shared: Adventure · First-Person · Puzzle

Gone Home
Shared: Walking Simulator · First-Person · Exploration

FEZ
Shared: Platformer · Adventure · Puzzle

Riven
Shared: Adventure · First-Person · Puzzle

Slime Rancher
Shared: Adventure · Singleplayer · First-Person

Spirit of the North
Shared: Adventure · Casual · Singleplayer

NaissanceE
Shared: Walking Simulator · Adventure · First-Person

Journey
Shared: Adventure · Walking Simulator · Atmospheric

Outer Wilds
Shared: Adventure · Exploration · Singleplayer

Quern - Undying Thoughts
Shared: Adventure · Walking Simulator · Puzzle

Monument Valley
Shared: Adventure · Casual · Singleplayer

The Beginner's Guide
Shared: Walking Simulator · First-Person · Adventure

INFRA
Shared: Adventure · First-Person · Walking Simulator

Nephise
Shared: Adventure · Walking Simulator · Casual

Obduction
Shared: Adventure · First-Person · Puzzle

Tomb Raider Game of the Year
Shared: Adventure · Female Protagonist · Singleplayer

Stray
Shared: Adventure · Singleplayer · Atmospheric