Games like Decay: The Mare
Games like Decay: The Mare include Fran Bow, Little Nightmares II, Sally Face - Episode One, Poppy Playtime, and Little Nightmares. We matched them by the tags players give Decay: The Mare on Steam (Adventure, Horror, Indie, Point & Click, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

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

Little Nightmares II
Shared: Adventure · Horror · Puzzle

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

Poppy Playtime
Shared: Horror · Singleplayer · Puzzle

Little Nightmares
Shared: Horror · Adventure · Singleplayer

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

The Room
Shared: Point & Click · Adventure · Puzzle

Rusty Lake Paradise
Shared: Adventure · Indie · Point & Click

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

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Adventure

Samsara Room
Shared: Adventure · Indie · Puzzle

Servant of the Lake
Shared: Adventure · Point & Click · Puzzle

Outlast
Shared: Horror · Psychological Horror · First-Person

Inside the Backrooms
Shared: Horror · Adventure · Psychological Horror

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

Escape the Backrooms
Shared: Horror · Psychological Horror · Multiplayer

The Room 4: Old Sins
Shared: Adventure · Point & Click · Puzzle

Buckshot Roulette
Shared: Horror · Multiplayer · Indie

Detention
Shared: Horror · Indie · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Atmospheric

The Cat Lady
Shared: Horror · Adventure · Indie

MiSide
Shared: Psychological Horror · Horror · Singleplayer

Underground Blossom
Shared: Adventure · Point & Click · Indie

Firewatch
Shared: Adventure · Indie · Singleplayer