Games like P·O·L·L·E·N
Games like P·O·L·L·E·N include Firewatch, No Man's Sky, What Remains of Edith Finch, Outer Wilds, and Fallout 4. We matched them by the tags players give P·O·L·L·E·N on Steam (Adventure, Sci-fi, Exploration, Atmospheric, and First-Person): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · First-Person

No Man's Sky
Shared: Exploration · Sci-fi · Adventure

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

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Fallout 4
Shared: Exploration · Adventure · Atmospheric

Lethal Company
Shared: First-Person · Exploration · Sci-fi

Valley
Shared: Adventure · Exploration · First-Person

The Talos Principle
Shared: Sci-fi · First-Person · Atmospheric

The Long Dark
Shared: Exploration · Atmospheric · Adventure

Stray
Shared: Adventure · Atmospheric · Exploration

Cradle
Shared: Adventure · Sci-fi · Atmospheric

PEAK
Shared: Adventure · Exploration · First-Person

Obduction
Shared: Adventure · Exploration · First-Person

NaissanceE
Shared: Exploration · Atmospheric · Adventure

SOMA
Shared: Atmospheric · Sci-fi · Exploration

Scanner Sombre
Shared: Exploration · Adventure · Atmospheric

The Solus Project
Shared: Adventure · Exploration · Sci-fi

Journey
Shared: Adventure · Atmospheric · Exploration

Gone Home
Shared: Exploration · Atmospheric · First-Person

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

ROUTINE
Shared: Sci-fi · Atmospheric · Adventure

Pacific Drive
Shared: Exploration · Sci-fi · Adventure

Tacoma
Shared: Adventure · Sci-fi · Exploration

Layers of Fear (2016)
Shared: Atmospheric · First-Person · Adventure