Games like 秦こころ弾幕連
Games like 秦こころ弾幕連 include Vampire Survivors, LUFTRAUSERS, Exit the Gungeon, Touhou Kinjoukyou ~ Fossilized Wonders., and Bit Blaster XL. We matched them by the tags players give 秦こころ弾幕連 on Steam (Action, Shooter, Arcade, Bullet Hell, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Action

LUFTRAUSERS
Shared: Action · Arcade · Bullet Hell

Exit the Gungeon
Shared: Action · Arcade · Bullet Hell

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Shooter · Action · Bullet Hell

Bit Blaster XL
Shared: Bullet Hell · Shooter · Arcade

DRAINUS
Shared: Action · Shooter · 2D

Planes, Bullets and Vodka
Shared: Action · Bullet Hell · Arcade

Windowkill
Shared: Action · Bullet Hell · Arcade

Bright Memory: Infinite
Shared: Action · Shooter · Female Protagonist

Nova Drift
Shared: Bullet Hell · Arcade · Shooter

ZeroRanger
Shared: Action · Bullet Hell · Arcade

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Shooter · Bullet Hell

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Action · Female Protagonist

Mushihimesama
Shared: Action · Bullet Hell · Arcade

Swarmlake
Shared: Action · Shooter · Arcade

Revolution Ace
Shared: Action · Shooter · Bullet Hell

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Action · Bullet Hell · Shooter

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · 2D · Action

Broforce
Shared: Action · 2D · Shooter

My Friend Pedro
Shared: Action · Shooter · Indie

Ikaruga
Shared: Arcade · Bullet Hell · Action

Star Saviors
Shared: Action · Bullet Hell · Arcade

Bleed
Shared: Action · Shooter · 2D