Games like Touhou: BlackEight
Games like Touhou: BlackEight include A Hat in Time, MiSide, Firewatch, Layers of Fear (2016), and Five Nights at Freddy's: Security Breach. We matched them by the tags players give Touhou: BlackEight on Steam (Adventure, Walking Simulator, Collectathon, Hidden Object, and 3D): closest matches first, and among equally close ones the better-known games.

A Hat in Time
Shared: Collectathon · Cute · Adventure

MiSide
Shared: Cute · 3D · Horror

Firewatch
Shared: Adventure · Walking Simulator · Indie

Layers of Fear (2016)
Shared: Walking Simulator · Horror · Adventure

Five Nights at Freddy's: Security Breach
Shared: Horror · Adventure · 3D

The Stanley Parable
Shared: Walking Simulator · Adventure · Indie

The Invincible
Shared: Adventure · Walking Simulator · Female Protagonist

Happy Game
Shared: Cute · Psychedelic · Horror

OneShot
Shared: Cute · Adventure · Indie

Little Misfortune
Shared: Adventure · Indie · Horror

Stray
Shared: Adventure · Cute · Singleplayer

nophenia
Shared: Walking Simulator · Cute · Surreal

Platform 8
Shared: Adventure · Walking Simulator · Hidden Object

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Indie

When The Past Was Around
Shared: Hidden Object · Cute · Surreal

Spooky's Jump Scare Mansion: HD Renovation
Shared: Adventure · Horror · Cute

Eclipsium
Shared: Walking Simulator · Psychedelic · Surreal

The Exit 8
Shared: Walking Simulator · Horror · 3D

The Cabin Factory
Shared: Walking Simulator · Adventure · Horror

NaissanceE
Shared: Walking Simulator · Adventure · Indie

Oxenfree
Shared: Adventure · Indie · Horror

Anthology Of The Killer
Shared: Walking Simulator · Horror · Adventure

Slime Rancher 2
Shared: Cute · Adventure · 3D

Slime Rancher
Shared: Adventure · Cute · Singleplayer