Games like ASCII Survivors
Games like ASCII Survivors include Megabonk, Vampire Survivors, Brotato, Yet Another Zombie Survivors, and 20 Minutes Till Dawn. We matched them by the tags players give ASCII Survivors on Steam (Action Roguelike, Indie, Bullet Hell, Bullet Heaven, and Roguelite): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Indie

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Brotato
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Yet Another Zombie Survivors
Shared: Action Roguelike · Bullet Heaven · Indie

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

BALL x PIT
Shared: Bullet Hell · Roguelite · Action Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Death Must Die
Shared: Action Roguelike · Bullet Hell · Roguelite

The Spell Brigade
Shared: Bullet Heaven · Bullet Hell · Action Roguelike

Nova Drift
Shared: Bullet Hell · Action Roguelike · Roguelite

Arms of God
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Hades
Shared: Action Roguelike · Indie · Roguelite

Nuclear Throne
Shared: Action Roguelike · Indie · Bullet Hell

Windowkill
Shared: Indie · Action Roguelike · Bullet Hell

Rogue: Genesia
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Time Wasters
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Skul: The Hero Slayer
Shared: Indie · Action Roguelike · Action

Be My Horde
Shared: Action Roguelike · Indie · Bullet Hell