Games like Tren0
Games like Tren0 include OMORI, OneShot, Firework, Tales of the Black Forest, and Undertale. We matched them by the tags players give Tren0 on Steam (Horror, RPG, Multiple Endings, Thriller, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

OMORI
Shared: Psychological Horror · RPG · Pixel Graphics

OneShot
Shared: Pixel Graphics · Story Rich · Puzzle

Firework
Shared: Horror · Puzzle · Psychological Horror

Tales of the Black Forest
Shared: RPG · Horror · Pixel Graphics

Undertale
Shared: Multiple Endings · RPG · Pixel Graphics

Ib
Shared: Horror · Pixel Graphics · RPG

Angels of Death
Shared: Horror · RPG · Pixel Graphics

MiSide
Shared: Horror · Psychological Horror · Story Rich

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Atmospheric · Story Rich

The Test
Shared: Multiple Endings · Psychological Horror · Pixel Graphics

The Witch's House MV
Shared: Horror · RPG · Pixel Graphics

DISTRAINT: Deluxe Edition
Shared: Horror · Psychological Horror · Pixel Graphics

Little Nightmares II
Shared: Horror · Puzzle · Psychological Horror

Papers, Please
Shared: Pixel Graphics · Multiple Endings · Puzzle

No, I'm not a Human
Shared: Horror · Psychological Horror · Multiple Endings

Detention
Shared: Horror · Psychological Horror · Puzzle

Sally Face - Episode One
Shared: Horror · Psychological Horror · Story Rich

Fran Bow
Shared: Horror · Psychological Horror · Puzzle

OFF
Shared: RPG · Pixel Graphics · Psychological Horror

Little Nightmares
Shared: Horror · Atmospheric · Puzzle

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Mad Father
Shared: Horror · Psychological Horror · Pixel Graphics

SILENT HILL 2
Shared: Horror · Psychological Horror · Atmospheric

DELTARUNE
Shared: RPG · Pixel Graphics · Story Rich