Games like Seclusion
Games like Seclusion include Resident Evil Requiem, A Plague Tale: Requiem, VLADiK BRUTAL, Half-Life 2, and The Forest. We matched them by the tags players give Seclusion on Steam (Action, Adventure, Action-Adventure, Sandbox, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Resident Evil Requiem
Shared: Action · FPS · Action-Adventure

A Plague Tale: Requiem
Shared: Action · Adventure · Action-Adventure

VLADiK BRUTAL
Shared: Action · FPS · Adventure

Half-Life 2
Shared: Action · FPS · Adventure

The Forest
Shared: Adventure · Action · First-Person

Atomic Heart
Shared: Adventure · Action · FPS

Ready or Not
Shared: FPS · Realistic · Action

Zort
Shared: Action · First-Person · Action-Adventure

BioShock Infinite
Shared: Action · FPS · First-Person

Far Cry 3
Shared: Action · Adventure · FPS

Far Cry® 5
Shared: Action-Adventure · FPS · Action

Hello Neighbor
Shared: Sandbox · First-Person · Action-Adventure

Far Cry® 2
Shared: Action · FPS · Adventure

METRO 2033 Redux
Shared: Action · FPS · Atmospheric

Crysis Remastered
Shared: Action · FPS · Sandbox

SILENT HILL: Townfall
Shared: Adventure · Action · Action-Adventure

Total Chaos
Shared: Action · Adventure · Action-Adventure

METRO Last Light Redux
Shared: Action · FPS · Atmospheric

BONELAB
Shared: Action · Sandbox · Action-Adventure

Black Mesa
Shared: Action · FPS · First-Person

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · Action · First-Person

Outlast
Shared: First-Person · Adventure · Atmospheric

Far Cry® 6
Shared: Action-Adventure · Action · FPS

Metro Exodus
Shared: FPS · Action · Adventure