Games like Appointment
Games like Appointment include Outlast, Poppy Playtime, Escape the Backrooms, Amnesia: The Dark Descent, and Lethal Company. We matched them by the tags players give Appointment on Steam (Horror, Survival Horror, First-Person, Puzzle, and Stealth): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · First-Person

Poppy Playtime
Shared: Horror · Puzzle · First-Person

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

Amnesia: The Dark Descent
Shared: Horror · Survival Horror · Puzzle

Lethal Company
Shared: Horror · First-Person · Survival Horror

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

SOMA
Shared: Horror · Survival Horror · Atmospheric

Inside the Backrooms
Shared: Horror · Survival Horror · Puzzle

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

The Outlast Trials
Shared: Horror · Survival Horror · First-Person

Amnesia: Rebirth
Shared: First-Person · Puzzle · Horror

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

Little Nightmares
Shared: Horror · Adventure · Atmospheric

Little Nightmares II
Shared: Horror · Puzzle · Adventure

Outlast 2
Shared: Horror · Survival Horror · First-Person

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

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

Hello Neighbor 2
Shared: Horror · Puzzle · First-Person

Penumbra Overture
Shared: Horror · First-Person · Survival Horror

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

Alien: Isolation
Shared: Horror · Survival Horror · First-Person

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

The Forest
Shared: Horror · Survival Horror · Adventure

Darkwood
Shared: Horror · Survival Horror · Adventure