Games like The Next Door
Games like The Next Door include The Exit 8, The Death | Thần Trùng, Moncage, The Beginner's Guide, and The Stanley Parable. We matched them by the tags players give The Next Door on Steam (Indie, Casual, Adventure, Puzzle, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

The Exit 8
Shared: Puzzle · Walking Simulator · First-Person

The Death | Thần Trùng
Shared: Indie · Puzzle · Adventure

Moncage
Shared: Casual · Indie · Puzzle

The Beginner's Guide
Shared: Indie · Walking Simulator · First-Person

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

Obduction
Shared: Adventure · Indie · Puzzle

Fatum Betula
Shared: Indie · Casual · Adventure

The Unfinished Swan
Shared: Adventure · Indie · Puzzle

Antichamber
Shared: Indie · Puzzle · First-Person

Plug & Play
Shared: Indie · Casual · Adventure

The Witness
Shared: Puzzle · Indie · First-Person

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

Layers of Fear (2016)
Shared: Walking Simulator · Indie · Psychological Horror

Firewatch
Shared: Adventure · Walking Simulator · First-Person

Call of the Sea
Shared: Adventure · Puzzle · Indie

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · First-Person

Fears to Fathom® - Scratch Creek
Shared: Adventure · Casual · Indie

There Is No Game: Wrong Dimension
Shared: Indie · Puzzle · Adventure

Pikuniku
Shared: Indie · Casual · Adventure

Jazzpunk: Director's Cut
Shared: Indie · Adventure · Surreal

NaissanceE
Shared: Indie · Walking Simulator · Adventure

Poppy Playtime
Shared: Puzzle · First-Person · Indie

A Story About My Uncle
Shared: Adventure · Indie · First-Person

Samsara Room
Shared: Indie · Adventure · Puzzle