Games like Floor44
Games like Floor44 include Sons Of The Forest, Subnautica 2, Escape the Backrooms, PEAK, and Dead by Daylight. We matched them by the tags players give Floor44 on Steam (Multiplayer, Adventure, Roguelike, Dungeon Crawler, and Survival): closest matches first, and among equally close ones the better-known games.

Sons Of The Forest
Shared: Multiplayer · Co-op · Survival

Subnautica 2
Shared: Multiplayer · Co-op · Survival

Escape the Backrooms
Shared: Multiplayer · Co-op · Horror

PEAK
Shared: Multiplayer · Co-op · Adventure

Dead by Daylight
Shared: Multiplayer · Co-op · Horror

Don't Starve Together
Shared: Multiplayer · Co-op · Survival

Gunfire Reborn
Shared: Roguelike · Co-op · Multiplayer

The Outlast Trials
Shared: Multiplayer · Co-op · Horror

R.E.P.O.
Shared: Multiplayer · Co-op · Horror

The Forest
Shared: Survival · Adventure · Horror

Left 4 Dead 2
Shared: Co-op · Multiplayer · Survival

Lethal Company
Shared: Co-op · Horror · Survival Horror

Grounded
Shared: Multiplayer · Co-op · Survival

Terraria
Shared: Multiplayer · Survival · Adventure

Dying Light
Shared: Survival Horror · Horror · Survival

Inside the Backrooms
Shared: Multiplayer · Co-op · Horror

Backrooms: Escape Together
Shared: Multiplayer · Co-op · Horror

Once Human
Shared: Multiplayer · Co-op · Survival

Content Warning
Shared: Multiplayer · Horror · Co-op

Rust
Shared: Multiplayer · Survival · Adventure

Monster Hunter: World
Shared: Multiplayer · Co-op · Adventure

Outlast
Shared: Horror · Survival Horror · Multiplayer

Pacify
Shared: Multiplayer · Co-op · Horror

Barotrauma
Shared: Multiplayer · Co-op · Survival