Games like Languish
Games like Languish include Five Nights at Freddy's: Security Breach, Escape the Backrooms, The Forest, Lethal Company, and Inside the Backrooms. We matched them by the tags players give Languish on Steam (Horror, Indie, Survival Horror, Crime, and Exploration): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Singleplayer

Escape the Backrooms
Shared: Horror · Survival Horror · Exploration

The Forest
Shared: Horror · Survival Horror · Adventure

Lethal Company
Shared: Horror · Survival Horror · Exploration

Inside the Backrooms
Shared: Horror · Survival Horror · Exploration

Poppy Playtime
Shared: Horror · Survival Horror · Singleplayer

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · Exploration

Sons Of The Forest
Shared: Survival Horror · Horror · Exploration

Subnautica: Below Zero
Shared: Horror · Exploration · Singleplayer

Five Nights at Freddy's
Shared: Horror · Survival Horror · Indie

Outlast
Shared: Horror · Survival Horror · Singleplayer

Subnautica 2
Shared: Horror · Exploration · Survival Horror

The Beast Inside
Shared: Horror · Survival Horror · Adventure

Bendy and the Dark Revival
Shared: Horror · Survival Horror · Indie

Choo-Choo Charles
Shared: Horror · Survival Horror · Singleplayer

Little Nightmares
Shared: Horror · Indie · Adventure

Subnautica
Shared: Horror · Exploration · Singleplayer

Resident Evil Requiem
Shared: Horror · Survival Horror · Singleplayer

Slender: The Arrival
Shared: Horror · Survival Horror · Indie

Backrooms: Escape Together
Shared: Horror · Survival Horror · Exploration

Granny
Shared: Horror · Survival Horror · Indie

SOMA
Shared: Horror · Survival Horror · Exploration

The Coma 2: Vicious Sisters
Shared: Horror · Indie · Survival Horror

Visage
Shared: Horror · Survival Horror · Indie