Games like Twin Ruin
Games like Twin Ruin include BALL x PIT, Brigador: Up-Armored Edition, Vampire Survivors, Enter the Gungeon, and Nova Drift. We matched them by the tags players give Twin Ruin on Steam (Twin Stick Shooter, Bullet Hell, Action, Indie, and Arcade): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Bullet Hell · Arcade

Brigador: Up-Armored Edition
Shared: Twin Stick Shooter · Action · Top-Down Shooter

Vampire Survivors
Shared: Bullet Hell · Indie · Action

Enter the Gungeon
Shared: Bullet Hell · Indie · Twin Stick Shooter

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

SYNTHETIK: Legion Rising
Shared: Action · Indie · Top-Down Shooter

Nex Machina
Shared: Twin Stick Shooter · Bullet Hell · Action

Nuclear Throne
Shared: Indie · Bullet Hell · Action

Windowkill
Shared: Action · Bullet Hell · Indie

Megabonk
Shared: Bullet Hell · Indie · Action

Greedland
Shared: Twin Stick Shooter · Bullet Hell · Shoot 'Em Up

Chippy
Shared: Twin Stick Shooter · Bullet Hell · Top-Down Shooter

Sky Force Reloaded
Shared: Bullet Hell · Arcade · Top-Down Shooter

Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

Cyberhunt
Shared: Action · Indie · Twin Stick Shooter

Halls of Torment
Shared: Bullet Hell · Action · Arcade

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Top-Down Shooter · Action

Voidigo
Shared: Twin Stick Shooter · Bullet Hell · Top-Down Shooter

Assault Android Cactus+
Shared: Twin Stick Shooter · Bullet Hell · Arcade

UBERMOSH:BLACK
Shared: Action · Indie · Bullet Hell

UBERMOSH
Shared: Action · Indie · Arcade

Soulstone Survivors
Shared: Bullet Hell · Action · Action Roguelike

20 Minutes Till Dawn
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

UBERMOSH Vol.5
Shared: Action · Indie · Arcade