Games like Super Monk War Z
Games like Super Monk War Z include Vampire Survivors, Planes, Bullets and Vodka, Bit Blaster XL, LUFTRAUSERS, and Geometry Wars: Retro Evolved. We matched them by the tags players give Super Monk War Z on Steam (Shoot 'Em Up, Casual, Singleplayer, Bullet Hell, and Score Attack): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Singleplayer · 2D

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

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

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

Geometry Wars: Retro Evolved
Shared: Casual · Bullet Hell · Singleplayer

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

Cyberhunt
Shared: Casual · Shoot 'Em Up · Indie

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Singleplayer

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

DRAINUS
Shared: Shoot 'Em Up · Singleplayer · Indie

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

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

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

Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Indie

Apocalypse Party
Shared: Casual · Singleplayer · Shoot 'Em Up

DEVIL BLADE REBOOT
Shared: Shoot 'Em Up · Score Attack · Shooter

Star Saviors
Shared: Shoot 'Em Up · Bullet Hell · Indie

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

Beat Hazard
Shared: Shoot 'Em Up · Bullet Hell · 2D

Boneraiser Minions
Shared: Bullet Hell · 2D · Singleplayer

Seraph's Last Stand
Shared: Casual · Bullet Hell · 2D

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

Timberman
Shared: Casual · Singleplayer · Indie

Star of Providence
Shared: Shoot 'Em Up · Bullet Hell · Indie