Games like Undergod
Games like Undergod include Hades, Hades II, Dead Cells, Skul: The Hero Slayer, and Have a Nice Death. We matched them by the tags players give Undergod on Steam (Action, Roguelike, Action Roguelike, Hack and Slash, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Hack and Slash · Action

Hades II
Shared: Action · Roguelike · Hack and Slash

Dead Cells
Shared: Roguelike · Action Roguelike · Roguelite

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

Have a Nice Death
Shared: Action Roguelike · Hack and Slash · Action

Death Must Die
Shared: Action Roguelike · Roguelite · Action

Vampire Survivors
Shared: Action Roguelike · Roguelite · Roguelike

Halls of Torment
Shared: Action Roguelike · Roguelike · Roguelite

Anomaly Agent
Shared: Action Roguelike · 2D Platformer · Hack and Slash

Soulstone Survivors
Shared: Action Roguelike · Roguelike · Roguelite

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Roguelike · Action

Ravenswatch
Shared: Roguelike · Action Roguelike · Action

暖雪 Warm Snow
Shared: Action Roguelike · Roguelike · Roguelite

Megabonk
Shared: Roguelike · Action Roguelike · Roguelite

VOIN
Shared: Action · Action Roguelike · Hack and Slash

The Binding of Isaac: Rebirth
Shared: Roguelike · Action Roguelike · 2D

Rogue Legacy
Shared: Roguelike · Action · Action Roguelike

Children of Morta
Shared: Roguelike · Hack and Slash · Action Roguelike

The Binding of Isaac
Shared: Roguelike · Action Roguelike · Action

Brotato
Shared: Roguelike · Action Roguelike · Roguelite

Dungreed
Shared: Action Roguelike · Roguelike · Action

Dragon Is Dead
Shared: Roguelike · Action Roguelike · Action

ELDEN RING NIGHTREIGN
Shared: Roguelike · Action · Souls-like

Risk of Rain 2
Shared: Action Roguelike · Roguelike · Action