Games like Plantiquarian
Games like Plantiquarian include The Witness, Spirit of the North, The Exit 8, What Remains of Edith Finch, and Riven. We matched them by the tags players give Plantiquarian on Steam (Exploration, Puzzle, Casual, Walking Simulator, and 3D): closest matches first, and among equally close ones the better-known games.

The Witness
Shared: Exploration · Puzzle · First-Person

Spirit of the North
Shared: Exploration · Puzzle · Casual

The Exit 8
Shared: Exploration · Puzzle · Walking Simulator

What Remains of Edith Finch
Shared: Walking Simulator · Exploration · Atmospheric

Riven
Shared: Puzzle · Exploration · First-Person

Creature Kitchen
Shared: Puzzle · Nature · First-Person

Firewatch
Shared: Walking Simulator · Atmospheric · Exploration

Carto
Shared: Puzzle · Exploration · Indie

Slime Rancher
Shared: Exploration · Casual · First-Person

COCOON
Shared: Puzzle · Exploration · Atmospheric

Moncage
Shared: Puzzle · Casual · Exploration

Journey
Shared: Exploration · Atmospheric · Walking Simulator

Sizeable
Shared: Puzzle · Casual · Exploration

Blue Prince
Shared: Puzzle · Exploration · First-Person

Scanner Sombre
Shared: Exploration · Walking Simulator · Atmospheric

INFRA
Shared: Exploration · Puzzle · Walking Simulator

NaissanceE
Shared: Exploration · Walking Simulator · Atmospheric

Big Walk
Shared: Puzzle · Exploration · Casual

Gorogoa
Shared: Puzzle · Casual · Atmospheric

Stray
Shared: Exploration · Atmospheric · Puzzle

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

Flower
Shared: Casual · Exploration · Nature

Outer Wilds
Shared: Exploration · Puzzle · Atmospheric

The Unfinished Swan
Shared: Puzzle · Exploration · Casual