Games like Realmlords
Games like Realmlords include Tiny Rogues, Enter the Gungeon, Death Must Die, Hades, and Halls of Torment. We matched them by the tags players give Realmlords on Steam (Action Roguelike, Bullet Hell, Hack and Slash, Mystery Dungeon, and Action): closest matches first, and among equally close ones the better-known games.

Tiny Rogues
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

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

Death Must Die
Shared: Action Roguelike · Bullet Hell · Hack and Slash

Hades
Shared: Action Roguelike · Hack and Slash · Action

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

Shape of Dreams
Shared: Action Roguelike · Hack and Slash · PvE

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Bullet Hell · Hack and Slash

Dead Cells
Shared: Action Roguelike · Hack and Slash · Roguelike

Hades II
Shared: Action · Hack and Slash · Action Roguelike

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

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Action

Cinderia
Shared: Action Roguelike · Hack and Slash · Action

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

Hero Siege
Shared: Action Roguelike · Hack and Slash · Action

Lost Castle
Shared: Action Roguelike · Hack and Slash · Dungeon Crawler

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Hack and Slash

Minecraft Dungeons
Shared: Hack and Slash · Dungeon Crawler · Action

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

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelike

Wizard of Legend
Shared: Action Roguelike · Dungeon Crawler · Action

Heroes of Hammerwatch II
Shared: Action Roguelike · Action · Dungeon Crawler

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