Games like Gloomsday
Games like Gloomsday include Dead Cells, Skul: The Hero Slayer, Rogue Legacy, Hades, and Vampire Survivors. We matched them by the tags players give Gloomsday on Steam (Roguelike, Platformer, 2D Platformer, Roguelite, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Dead Cells
Shared: Roguelike · Action Roguelike · Adventure

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

Rogue Legacy
Shared: Roguelike · Platformer · Action Roguelike

Hades
Shared: Roguelite · Action Roguelike · Roguelike

Vampire Survivors
Shared: Action Roguelike · Roguelite · Roguelike

Dungreed
Shared: Roguelike · Action Roguelike · Roguelite

Hades II
Shared: Roguelike · Roguelite · Action

Streets of Rogue
Shared: Roguelite · Action Roguelike · Roguelike

Neon Abyss
Shared: Roguelike · Platformer · Pixel Graphics

Halls of Torment
Shared: Roguelite · Action Roguelike · Roguelike

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

暖雪 Warm Snow
Shared: Roguelite · Roguelike · Action Roguelike

The Binding of Isaac: Rebirth
Shared: Roguelike · Action Roguelike · Pixel Graphics

Caveblazers
Shared: Platformer · Roguelike · Action Roguelike

BlazBlue Entropy Effect
Shared: Action Roguelike · Platformer · Action-Adventure

Anomaly Agent
Shared: 2D Platformer · Platformer · Action Roguelike

Rogue Legacy 2
Shared: Platformer · Roguelite · Action

UnderMine
Shared: Roguelite · Action Roguelike · Action

Gunfire Reborn
Shared: Roguelike · Roguelite · Action Roguelike

Death Must Die
Shared: Action Roguelike · Roguelite · Roguelike

Megabonk
Shared: Roguelike · Action Roguelike · Roguelite

Noita
Shared: Roguelike · Pixel Graphics · Action Roguelike

Sephiria
Shared: Roguelike · Roguelite · Action Roguelike

Moonlighter
Shared: Roguelike · Roguelite · Action Roguelike