Games like Under The Floor
Games like Under The Floor include Five Nights at Freddy's: Security Breach, The Forest, Resident Evil Village, Resident Evil 7 Biohazard, and Lethal Company. We matched them by the tags players give Under The Floor on Steam (Action, Rhythm, Exploration, First-Person, and Horror): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Singleplayer

The Forest
Shared: Horror · Action · First-Person

Resident Evil Village
Shared: Action · First-Person · Horror

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Singleplayer

Lethal Company
Shared: First-Person · Horror · Exploration

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

Bendy and the Dark Revival
Shared: Action · Horror · First-Person

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

The Beast Inside
Shared: Horror · First-Person · Action

Trepang2
Shared: Action · Horror · Singleplayer

Crime Scene Cleaner
Shared: First-Person · Singleplayer · Action

Metro Exodus
Shared: Action · Singleplayer · Horror

Ready or Not
Shared: Singleplayer · Horror · First-Person

Dying Light: The Beast
Shared: Action · Horror · First-Person

Slime Rancher
Shared: Exploration · First-Person · Singleplayer

Outlast
Shared: First-Person · Horror · Singleplayer

KovaaK's
Shared: Action · First-Person · Indie

Bendy and the Ink Machine
Shared: First-Person · Horror · Singleplayer

Thief Simulator
Shared: First-Person · Singleplayer · Action

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Outlast 2
Shared: Horror · First-Person · Singleplayer

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

Buckshot Roulette
Shared: First-Person · Horror · Singleplayer

Valley
Shared: Exploration · First-Person · Action