Games like Beetle Forest
Games like Beetle Forest include Five Nights at Freddy's: Security Breach, SOMA, Firewatch, What Remains of Edith Finch, and Layers of Fear (2016). We matched them by the tags players give Beetle Forest on Steam (Horror, Exploration, Multiple Endings, Dark, and Nature): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · Multiple Endings · Exploration

SOMA
Shared: Horror · Dark · Exploration

Firewatch
Shared: Walking Simulator · Exploration · Adventure

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

Layers of Fear (2016)
Shared: Horror · Walking Simulator · First-Person

Still Wakes the Deep
Shared: Horror · Walking Simulator · Dark

Buckshot Roulette
Shared: Horror · Dark · First-Person

Escape the Backrooms
Shared: Horror · Exploration · First-Person

Poppy Playtime
Shared: Horror · Dark · First-Person

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Exploration

Resident Evil Requiem
Shared: Horror · First-Person · FPS

September 7th
Shared: Horror · Exploration · Walking Simulator

Amenti
Shared: Horror · Exploration · Dark

Inside the Backrooms
Shared: Horror · Exploration · First-Person

Visage
Shared: Horror · Dark · First-Person

Outlast
Shared: Horror · First-Person · Dark

The Exit 8
Shared: Exploration · Horror · Walking Simulator

Subnautica
Shared: Horror · Exploration · First-Person

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Exploration · First-Person

The Inn-Sanity
Shared: Horror · Exploration · Walking Simulator

Five Nights at Freddy's: Into the Pit
Shared: Horror · Exploration · Multiple Endings

Choo-Choo Charles
Shared: Horror · Dark · First-Person

Scanner Sombre
Shared: Exploration · Horror · Walking Simulator

Bad Parenting 1: Mr. Red Face
Shared: Horror · Walking Simulator · Exploration