Games like Caster's Trap
Games like Caster's Trap include Firework, No, I'm not a Human, Poppy Playtime, Sally Face - Episode One, and The Room Two. We matched them by the tags players give Caster's Trap on Steam (Horror, Mystery, Puzzle, Atmospheric, and Magic): closest matches first, and among equally close ones the better-known games.

Firework
Shared: Horror · Puzzle · Mystery

No, I'm not a Human
Shared: Horror · Choices Matter · Atmospheric

Poppy Playtime
Shared: Horror · Puzzle · Mystery

Sally Face - Episode One
Shared: Horror · Puzzle · Mystery

The Room Two
Shared: Mystery · Puzzle · Horror

OneShot
Shared: Atmospheric · Puzzle · Choices Matter

Outer Wilds
Shared: Mystery · Atmospheric · Puzzle

OMORI
Shared: Horror · Psychological Horror · Multiple Endings

Darkwood
Shared: Horror · Atmospheric · Psychological Horror

Cube Escape Collection
Shared: Puzzle · Mystery · Horror

The Witcher 3: Wild Hunt — Remastered
Shared: Atmospheric · Choices Matter · Fantasy

SOMA
Shared: Horror · Atmospheric · Psychological Horror

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

The Room Three
Shared: Mystery · Puzzle · Atmospheric

The Room
Shared: Mystery · Puzzle · Atmospheric

Little Nightmares II
Shared: Horror · Puzzle · Atmospheric

Little Nightmares
Shared: Horror · Atmospheric · Puzzle

Rusty Lake Paradise
Shared: Puzzle · Horror · Atmospheric

ANIMAL WELL
Shared: Puzzle · Horror · Atmospheric

DISTRAINT: Deluxe Edition
Shared: Horror · Psychological Horror · Atmospheric

Endacopia
Shared: Horror · Puzzle · Psychological Horror

Inside the Backrooms
Shared: Horror · Puzzle · Psychological Horror

Fran Bow
Shared: Horror · Puzzle · Psychological Horror

Tormentum - Dark Sorrow
Shared: Horror · Puzzle · Mystery