Games like Hifuu Nightmare Diary ~ Violet Detector.
Games like Hifuu Nightmare Diary ~ Violet Detector. include Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil, Touhou Tenkuushou ~ Hidden Star in Four Seasons., TouHou Makuka Sai ~ Fantastic Danmaku Festival Part II, Touhou Fuujinroku ~ Mountain of Faith., and Touhou Kouryudou ~ Unconnected Marketeers.. We matched them by the tags players give Hifuu Nightmare Diary ~ Violet Detector. on Steam (Indie, Action, Bullet Hell, Faith, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Action · Shoot 'Em Up

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Great Soundtrack · Indie

TouHou Makuka Sai ~ Fantastic Danmaku Festival Part II
Shared: Indie · Bullet Hell · Great Soundtrack

Touhou Fuujinroku ~ Mountain of Faith.
Shared: Indie · Action · Bullet Hell

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shoot 'Em Up

Touhou Kanjuden ~ Legacy of Lunatic Kingdom.
Shared: Bullet Hell · Indie · Great Soundtrack

Touhou Kikeijuu ~ Wily Beast and Weakest Creature.
Shared: Indie · Bullet Hell · Great Soundtrack

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · Difficult

TouHou Makuka Sai ~ Fantastic Danmaku Festival
Shared: Indie · Bullet Hell · Action

Touhou Chireiden ~ Subterranean Animism.
Shared: Indie · Action · Bullet Hell

Muse Dash
Shared: Great Soundtrack · Female Protagonist · Anime

Celeste
Shared: Indie · Great Soundtrack · Difficult

LUFTRAUSERS
Shared: Indie · Bullet Hell · Action

Cuphead
Shared: Difficult · Great Soundtrack · Indie

Touhou Shinreibyou ~ Ten Desires.
Shared: Indie · Action · Bullet Hell

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Bullet Hell · Shoot 'Em Up

Touhou Seirensen ~ Undefined Fantastic Object.
Shared: Indie · Action · Bullet Hell

ZeroRanger
Shared: Indie · Bullet Hell · Action

Touhou Kishinjou ~ Double Dealing Character.
Shared: Indie · Bullet Hell · Action

永远消失的幻想乡 ~ The Disappearing of Gensokyo
Shared: Bullet Hell · Action · Faith

Hollow Knight
Shared: Indie · Great Soundtrack · Difficult

Just Shapes & Beats
Shared: Great Soundtrack · Bullet Hell · Indie

Geometry Dash
Shared: Great Soundtrack · Difficult · Indie

Vampire Survivors
Shared: Bullet Hell · Indie · Action