Games like Shmadow
Games like Shmadow include Cuphead, Enter the Gungeon, Just Shapes & Beats, Nuclear Throne, and Nex Machina. We matched them by the tags players give Shmadow on Steam (Indie, Action, Bullet Hell, Twin Stick Shooter, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.
Cuphead
Shared: Difficult · Indie · Co-op
Enter the Gungeon
Shared: Bullet Hell · Indie · Difficult
Just Shapes & Beats
Shared: Bullet Hell · Indie · Difficult
Nuclear Throne
Shared: Indie · Bullet Hell · Action
Nex Machina
Shared: Action · Bullet Hell · Twin Stick Shooter
ZeroRanger
Shared: Indie · Bullet Hell · Shoot 'Em Up
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Action
Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Action
Revolution Ace
Shared: Action · Indie · Shoot 'Em Up
Broforce
Shared: Action · Indie · Co-op
Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Difficult
LUFTRAUSERS
Shared: Indie · Bullet Hell · Action
Beat Hazard
Shared: Bullet Hell · Twin Stick Shooter · Shoot 'Em Up
Geometry Wars™ 3: Dimensions Evolved
Shared: Action · Twin Stick Shooter · Bullet Hell
Jets'n'Guns 2
Shared: Indie · Action · Shoot 'Em Up
Star Saviors
Shared: Action · Bullet Hell · Indie
SYNTHETIK: Legion Rising
Shared: Indie · Action · Difficult
Assault Android Cactus+
Shared: Bullet Hell · Twin Stick Shooter · Shoot 'Em Up
Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shoot 'Em Up
Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Indie · Shoot 'Em Up
Jets'n'Guns Gold
Shared: Action · Indie · Shoot 'Em Up
Hollow Knight: Silksong
Shared: Indie · Difficult · Great Soundtrack
HELLDIVERS™ Dive Harder Edition
Shared: Twin Stick Shooter · Action · Co-op
TouHou Makuka Sai ~ Fantastic Danmaku Festival Part II
Shared: Indie · Bullet Hell · Shoot 'Em Up