Games like Gloom
Games like Gloom include The Binding of Isaac: Rebirth, Skul: The Hero Slayer, Dead Cells, The Binding of Isaac, and Hades. We matched them by the tags players give Gloom on Steam (Action Roguelike, Indie, Action, Lovecraftian, and Adventure): closest matches first, and among equally close ones the better-known games.

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

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

Dead Cells
Shared: Action Roguelike · Adventure · Roguelike

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

Hades
Shared: Action Roguelike · Indie · Action

Risk of Rain (2013)
Shared: Action Roguelike · Indie · Action

Noita
Shared: Roguelike · Indie · Difficult

Vampire Survivors
Shared: Action Roguelike · Indie · Roguelite

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Indie

Dungreed
Shared: Action Roguelike · Action · Indie

Nuclear Throne
Shared: Action Roguelike · Indie · Roguelike

Hollow Knight
Shared: Indie · Difficult · 2D

ScourgeBringer
Shared: Indie · Action · Action Roguelike

Hollow Knight: Silksong
Shared: Indie · Difficult · 2D

Streets of Rogue
Shared: Action Roguelike · Action · Indie

Rogue Legacy
Shared: Indie · Action Roguelike · Action

Wizard of Legend
Shared: Action Roguelike · Roguelike · Action

Spelunky
Shared: Action Roguelike · Indie · Roguelike

Megabonk
Shared: Action Roguelike · Indie · Roguelike

Hades II
Shared: Action · Action Roguelike · Roguelike

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

Hyper Light Drifter
Shared: Indie · Adventure · Action

Ravenswatch
Shared: Action Roguelike · Roguelike · Action

Vagante
Shared: Action Roguelike · Action · Difficult