Games like Blameless
Games like Blameless include Poppy Playtime, Dark Deception, Outlast, We Were Here, and Inside the Backrooms. We matched them by the tags players give Blameless on Steam (Free to Play, Horror, Multiplayer, Adventure, and Puzzle): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Free to Play · Puzzle

Dark Deception
Shared: Free to Play · Horror · Multiplayer

Outlast
Shared: Horror · First-Person · Multiplayer

We Were Here
Shared: Free to Play · Multiplayer · Puzzle

Inside the Backrooms
Shared: Horror · Multiplayer · Puzzle

Ultimate Custom Night
Shared: Free to Play · Horror · Singleplayer

Samsara Room
Shared: Free to Play · Adventure · Puzzle

Sons Of The Forest
Shared: Multiplayer · Horror · Adventure

Little Nightmares II
Shared: Horror · Adventure · Puzzle

The Room
Shared: Puzzle · Adventure · Mystery

The Beast Inside
Shared: Horror · Adventure · Multiplayer

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

Granny
Shared: Horror · Multiplayer · Puzzle

Bendy and the Ink Machine
Shared: Horror · Puzzle · Singleplayer

Little Nightmares
Shared: Horror · Adventure · Singleplayer

Escape the Backrooms
Shared: Horror · Multiplayer · Adventure

Subnautica 2
Shared: Multiplayer · Horror · Adventure

Firewatch
Shared: Adventure · Atmospheric · Singleplayer

The Room Two
Shared: Puzzle · Horror · Adventure

Halo Infinite
Shared: Free to Play · Multiplayer · Singleplayer

Backrooms: Escape Together
Shared: Horror · Multiplayer · First-Person

Outlast 2
Shared: Horror · First-Person · Singleplayer

Slender: The Arrival
Shared: Horror · Multiplayer · Indie

Where Winds Meet
Shared: Free to Play · Multiplayer · Singleplayer