Games like Viscera
Games like Viscera include Deep Rock Galactic: Survivor, BALL x PIT, Vampire Survivors, Brotato, and Nova Drift. We matched them by the tags players give Viscera on Steam (Arcade, Bullet Hell, Action, Top-Down Shooter, and Sci-fi): closest matches first, and among equally close ones the better-known games.

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

BALL x PIT
Shared: Arcade · Action · Bullet Hell

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Arcade

Brotato
Shared: Bullet Hell · Singleplayer · Action Roguelike

Nova Drift
Shared: Bullet Hell · Arcade · Action Roguelike

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

Megabonk
Shared: Bullet Hell · Action Roguelike · Action

Yet Another Zombie Survivors
Shared: Top-Down Shooter · Arcade · Action Roguelike

Nuclear Throne
Shared: Bullet Hell · Action · Action Roguelike

Maniac
Shared: Top-Down Shooter · Bullet Hell · Singleplayer

Windowkill
Shared: Action · Bullet Hell · Arcade

Halo: Spartan Assault
Shared: Action · Top-Down Shooter · Sci-fi

20 Minutes Till Dawn
Shared: Bullet Hell · Top-Down Shooter · Action Roguelike

Goobies
Shared: Bullet Hell · Top-Down Shooter · Action Roguelike

Nex Machina
Shared: Bullet Hell · Arcade · Action

Halls of Torment
Shared: Bullet Hell · Action Roguelike · Action

Sektori
Shared: Arcade · Bullet Hell · Top-Down Shooter

Glyphica: Typing Survival
Shared: Bullet Hell · Top-Down Shooter · Action

Chippy
Shared: Bullet Hell · Arcade · Top-Down Shooter

Soulstone Survivors
Shared: Bullet Hell · Action Roguelike · Action

Crimzon Clover World EXplosion
Shared: Action · Bullet Hell · Arcade

UBERMOSH Vol.5
Shared: Arcade · Action · Bullet Hell

LUFTRAUSERS
Shared: Bullet Hell · Arcade · Action

Enter the Gungeon
Shared: Bullet Hell · Action Roguelike · Indie