Games like Optasia: The Last Visit
Games like Optasia: The Last Visit include Firewatch, What Remains of Edith Finch, The Beginner's Guide, Gone Home, and Before Your Eyes. We matched them by the tags players give Optasia: The Last Visit on Steam (Adventure, Casual, Atmospheric, Exploration, and Surreal): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · Exploration

What Remains of Edith Finch
Shared: Atmospheric · Adventure · Exploration

The Beginner's Guide
Shared: Atmospheric · Walking Simulator · Adventure

Gone Home
Shared: Exploration · Atmospheric · Walking Simulator

Before Your Eyes
Shared: Emotional · Narrative · Adventure

Journey
Shared: Adventure · Atmospheric · Exploration

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Layers of Fear (2016)
Shared: Atmospheric · Adventure · Walking Simulator

Fears to Fathom - Ironbark Lookout
Shared: Atmospheric · Adventure · Exploration

Riven
Shared: Adventure · Exploration · Atmospheric

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

POOLS
Shared: Atmospheric · Exploration · Walking Simulator

The Witness
Shared: Exploration · Atmospheric · First-Person

[Chillas Art] The Convenience Store
Shared: Adventure · Casual · Atmospheric

Fears to Fathom - Woodbury Getaway
Shared: Adventure · Casual · Atmospheric

Amnesia: A Machine For Pigs
Shared: Atmospheric · Walking Simulator · Exploration

Fallout 4
Shared: Adventure · Exploration · Atmospheric

The Stanley Parable
Shared: Adventure · Walking Simulator · First-Person

Obduction
Shared: Adventure · Exploration · Surreal

ABZU
Shared: Atmospheric · Adventure · Exploration

The Long Dark
Shared: Exploration · Atmospheric · Adventure

Spirit of the North
Shared: Adventure · Atmospheric · Exploration

Mouthwashing
Shared: Atmospheric · Psychological Horror · Surreal

Slime Rancher
Shared: Adventure · Exploration · Casual