Games like Smol Survivors
Games like Smol Survivors include Vampire Survivors, Halls of Torment, Death Must Die, BALL x PIT, and Megabonk. We matched them by the tags players give Smol Survivors on Steam (Action Roguelike, Bullet Hell, Top-Down Shooter, Action RPG, and Arcade): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · 2D

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

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

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

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelike

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Hero Siege
Shared: Action Roguelike · Action RPG · RPG

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

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

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

Nova Drift
Shared: Bullet Hell · Action Roguelike · Arcade

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · 2D

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

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

Rabbit and Steel
Shared: Bullet Hell · Action Roguelike · Roguelike

Rocket Rats
Shared: Action Roguelike · Bullet Hell · 2D

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

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

Rogue Legacy
Shared: Action Roguelike · Roguelike · 2D

Heroes of Hammerwatch II
Shared: Action Roguelike · Action RPG · RPG

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

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

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Bullet Hell · Roguelike