Games like DRAINUS
Games like DRAINUS include LUFTRAUSERS, Vampire Survivors, ZeroRanger, ICEY, and Planes, Bullets and Vodka. We matched them by the tags players give DRAINUS on Steam (Action, Shoot 'Em Up, Indie, Shooter, and Singleplayer): closest matches first, and among equally close ones the better-known games.
LUFTRAUSERS
Shared: Indie · Action · Shoot 'Em Up
Vampire Survivors
Shared: Indie · Bullet Hell · 2D
ZeroRanger
Shared: Shoot 'Em Up · Indie · Action
ICEY
Shared: Action · Female Protagonist · Indie
Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Shooter
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Action · Bullet Hell
Broforce
Shared: Action · 2D · Indie
Huntdown
Shared: Action · Shooter · Shoot 'Em Up
Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Action
Bright Memory: Infinite
Shared: Action · Indie · Female Protagonist
Skul: The Hero Slayer
Shared: Action · Indie · 2D
Blazing Chrome
Shared: Action · Indie · Shoot 'Em Up
Revolution Ace
Shared: Action · Shoot 'Em Up · Indie
Exit the Gungeon
Shared: Action · Indie · 2D
Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Shoot 'Em Up · Action · Bullet Hell
Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Shoot 'Em Up · Shooter
Zombotron
Shared: Action · Indie · 2D
Star Saviors
Shared: Shoot 'Em Up · Action · Indie
Jet Lancer
Shared: Action · Indie · Shoot 'Em Up
BLUE REVOLVER
Shared: Shoot 'Em Up · Action · Indie
Bleed
Shared: Action · Indie · Shooter
BALL x PIT
Shared: Action · Shoot 'Em Up · Bullet Hell
Touhou Kinjoukyou ～ Fossilized Wonders.
Shared: Shoot 'Em Up · Action · Shooter
METAL SLUG
Shared: Action · Shoot 'Em Up · 2D