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

Firework
Shared: Horror · Mystery · Singleplayer

Undertale
Shared: RPG · Multiple Endings · Singleplayer

Tales of the Black Forest
Shared: RPG · Horror · Indie

Sanfu
Shared: RPG · Mystery · 2D

OMORI
Shared: RPG · Indie · Multiple Endings

No, I'm not a Human
Shared: Horror · Singleplayer · Indie

Poppy Playtime
Shared: Singleplayer · Horror · Mystery

The Test
Shared: Multiple Endings · Singleplayer · Horror

KinitoPET
Shared: Horror · Multiple Endings · 2D

The Hex
Shared: Singleplayer · Mystery · Indie

The Test: Hypothesis Rising
Shared: Multiple Endings · Horror · Visual Novel

Legend of Mortal
Shared: RPG · Multiple Endings · Singleplayer

DELTARUNE
Shared: RPG · Singleplayer · 2D

子归 - Blossom
Shared: RPG · Mystery · Singleplayer

Lay a Beauty to Rest: The Darkness Peach Blossom Spring
Shared: Mystery · Visual Novel · Multiple Endings

Cyber Manhunt
Shared: RPG · Mystery · Singleplayer

Milk outside a bag of milk outside a bag of milk
Shared: Visual Novel · Multiple Endings · Indie

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · Horror · Multiple Endings

Look Outside
Shared: RPG · Horror · 2D

Raging Loop
Shared: Mystery · Visual Novel · Indie

Mirror 2: Project X
Shared: Singleplayer · Visual Novel · RPG

Volcano Princess
Shared: RPG · Multiple Endings · Visual Novel

PARANORMASIGHT: The Mermaid's Curse
Shared: RPG · Mystery · Horror

Hero's Adventure: Road to Passion
Shared: RPG · Multiple Endings · Singleplayer