Games like The Portsmoor Abysm
Games like The Portsmoor Abysm include Baba Is You, LIMBO, Void Stranger, OneShot, and Rain World. We matched them by the tags players give The Portsmoor Abysm on Steam (Sokoban, Puzzle, Atmospheric, Grid-Based Movement, and Adventure): closest matches first, and among equally close ones the better-known games.

Baba Is You
Shared: Puzzle · Sokoban · Difficult

LIMBO
Shared: Puzzle · Atmospheric · Adventure

Void Stranger
Shared: Puzzle · Sokoban · Adventure

OneShot
Shared: Atmospheric · Puzzle · Pixel Graphics

Rain World
Shared: Atmospheric · Difficult · 2D

Hyper Light Drifter
Shared: Atmospheric · Adventure · Pixel Graphics

Papers, Please
Shared: Puzzle · Pixel Graphics · Atmospheric

Isles of Sea and Sky
Shared: Puzzle · Adventure · Sokoban

The Escapists
Shared: Pixel Graphics · 2D · Puzzle

SANABI
Shared: Adventure · Pixel Graphics · 2D

CARRION
Shared: Pixel Graphics · Puzzle · 2D

Out There Somewhere
Shared: Puzzle · Adventure · Pixel Graphics

Titan Souls
Shared: Adventure · Pixel Graphics · Difficult

Hollow Knight
Shared: 2D · Atmospheric · Difficult

ANIMAL WELL
Shared: Puzzle · Atmospheric · Pixel Graphics

Brothers - A Tale of Two Sons
Shared: Atmospheric · Adventure · Puzzle

The Rewinder
Shared: Puzzle · Adventure · Atmospheric

Stray
Shared: Atmospheric · Adventure · Puzzle

UFO 50
Shared: Pixel Graphics · 2D · Adventure

Firework
Shared: Puzzle · Atmospheric · 2D

Little Nightmares
Shared: Atmospheric · Adventure · Puzzle

Jump King
Shared: Adventure · Difficult · Pixel Graphics

Celeste
Shared: Pixel Graphics · Difficult · 2D

Patrick's Parabox
Shared: Sokoban · Puzzle · 2D