Games like Gross Survivors
Games like Gross Survivors include Vampire Survivors, Brotato, BALL x PIT, Deep Rock Galactic: Survivor, and Mewgenics. We matched them by the tags players give Gross Survivors on Steam (Arena Shooter, Bullet Hell, Roguelite, 2D, and Cute): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Roguelite · 2D

Brotato
Shared: Bullet Hell · Arena Shooter · Roguelite

BALL x PIT
Shared: Roguelite · Bullet Hell · Action

Deep Rock Galactic: Survivor
Shared: Roguelite · Bullet Hell · Arena Shooter

Mewgenics
Shared: Roguelite · Cute · 2D

Megabonk
Shared: Roguelite · Bullet Hell · Action

Nova Drift
Shared: Bullet Hell · Roguelite · Arena Shooter

FatalZone
Shared: Bullet Hell · Roguelite · Arena Shooter

Death Must Die
Shared: Bullet Hell · Roguelite · 2D

Noobs Are Coming
Shared: Arena Shooter · Roguelite · Bullet Hell

Rocket Rats
Shared: Bullet Hell · Roguelite · 2D

Halls of Torment
Shared: Bullet Hell · Roguelite · Action

Cursorblade
Shared: Bullet Hell · Roguelite · 2D

Time Wasters
Shared: Bullet Hell · Arena Shooter · Roguelite

God Of Weapons
Shared: Roguelite · Bullet Hell · Arena Shooter

Turnip Boy Commits Tax Evasion
Shared: Cute · Top-Down · 2D

Arms of God
Shared: Bullet Hell · Arena Shooter · Roguelite

Cult of the Lamb
Shared: Cute · Roguelite · 2D

Boneraiser Minions
Shared: Bullet Hell · Roguelite · 2D

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Hell · Roguelite · 2D

Noobs Want to Live
Shared: Bullet Hell · Roguelite · Action

Glyphica: Typing Survival
Shared: Arena Shooter · Bullet Hell · Roguelite

Utopia Must Fall
Shared: Roguelite · Bullet Hell · Casual

Touhou Hero of Ice Fairy
Shared: Bullet Hell · Roguelite · Cute