Games like _message:
Games like _message: include Outer Wilds, MiSide, Amanda the Adventurer, Sally Face - Episode One, and Fran Bow. We matched them by the tags players give _message: on Steam (Interactive Fiction, Puzzle, Space, Point & Click, and First-Person): closest matches first, and among equally close ones the better-known games.

Outer Wilds
Shared: Space · Puzzle · Story Rich

MiSide
Shared: First-Person · Psychological Horror · Horror

Amanda the Adventurer
Shared: Puzzle · First-Person · Horror

Sally Face - Episode One
Shared: Puzzle · Psychological Horror · Horror

Fran Bow
Shared: Puzzle · Point & Click · Psychological Horror

Poppy Playtime
Shared: Puzzle · Horror · First-Person

The Room Two
Shared: Puzzle · Point & Click · Horror

Stories Untold
Shared: Text-Based · Horror · Point & Click

Observation
Shared: Space · Puzzle · Horror

The Room
Shared: Puzzle · Point & Click · First-Person

The Room 4: Old Sins
Shared: Puzzle · Point & Click · First-Person

The Room Three
Shared: Puzzle · Point & Click · Adventure

Killer Frequency
Shared: Puzzle · Interactive Fiction · Horror

SOMA
Shared: Horror · Psychological Horror · First-Person

Detention
Shared: Puzzle · Horror · Psychological Horror

Inside the Backrooms
Shared: Puzzle · Horror · Psychological Horror

Rusty Lake Paradise
Shared: Puzzle · Point & Click · Horror

Cube Escape Collection
Shared: Puzzle · Point & Click · Horror

The Turing Test
Shared: Puzzle · Space · First-Person

Dagon: by H. P. Lovecraft
Shared: Horror · First-Person · Interactive Fiction

Garten of Banban
Shared: First-Person · Puzzle · Horror

Servant of the Lake
Shared: Puzzle · Point & Click · Story Rich

Amanda the Adventurer 2
Shared: Puzzle · Interactive Fiction · Point & Click

Firework
Shared: Puzzle · Horror · Psychological Horror