Games like Rotschwert
Games like Rotschwert include BALL x PIT, NieR:Automata™, Bit Blaster XL, Mushihimesama, and Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil. We matched them by the tags players give Rotschwert on Steam (Action, Bullet Hell, Shoot 'Em Up, Mystery, and Hack and Slash): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Bullet Hell · Shoot 'Em Up

NieR:Automata™
Shared: Hack and Slash · Action · Female Protagonist

Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Action

Mushihimesama
Shared: Bullet Hell · Shoot 'Em Up · Action

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

ICEY
Shared: Action · Female Protagonist · Hack and Slash

ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Action

Vampire Survivors
Shared: Bullet Hell · 2D · Action

Stellar Blade™
Shared: Action · Female Protagonist · Hack and Slash

LUFTRAUSERS
Shared: Bullet Hell · Action · Shoot 'Em Up

Furi
Shared: Bullet Hell · Hack and Slash · Shoot 'Em Up

Last Command
Shared: Bullet Hell · Action · 2D

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Shoot 'Em Up · Action

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Shoot 'Em Up · Female Protagonist

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

BLUE REVOLVER
Shared: Bullet Hell · Shoot 'Em Up · Action

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Hades II
Shared: Action · Hack and Slash · Female Protagonist

DRAINUS
Shared: Action · Shoot 'Em Up · Bullet Hell

Dimension Tripper Neptune: TOP NEP
Shared: Action · Bullet Hell · Shoot 'Em Up

TouHou Makuka Sai ~ Fantastic Danmaku Festival Part III
Shared: Bullet Hell · Shoot 'Em Up · Action

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell

Neptunia Shooter
Shared: Action · Bullet Hell · Shoot 'Em Up

Touhou Fuujinroku ~ Mountain of Faith.
Shared: Action · Bullet Hell · Shoot 'Em Up