Games like Shikhondo: Youkai Rampage
Games like Shikhondo: Youkai Rampage include BALL x PIT, Sky Force Reloaded, Planes, Bullets and Vodka, Vampire Survivors, and Bit Blaster XL. We matched them by the tags players give Shikhondo: Youkai Rampage on Steam (Action, Arcade, Bullet Hell, Shoot 'Em Up, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Sky Force Reloaded
Shared: Arcade · Shoot 'Em Up · Bullet Hell

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

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

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

Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade

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

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

LUFTRAUSERS
Shared: Arcade · Bullet Hell · Action

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

Dimension Tripper Neptune: TOP NEP
Shared: Action · Arcade · Bullet Hell

Mushihimesama
Shared: Bullet Hell · Arcade · Action

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

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

DoDonPachi Resurrection
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

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

A Dance of Fire and Ice
Shared: Arcade · 2D · Action

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

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

Gun Wings
Shared: Action · Bullet Hell · Shoot 'Em Up

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

ESCHATOS
Shared: Bullet Hell · Shoot 'Em Up · Arcade

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

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