Games like Gunmetal Arcadia
Games like Gunmetal Arcadia include Hades, Skul: The Hero Slayer, Lost Castle, Hades II, and Dead Cells. We matched them by the tags players give Gunmetal Arcadia on Steam (Action Roguelike, Side Scroller, Hack and Slash, Roguelite, and Dungeon Crawler): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

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

Lost Castle
Shared: Action Roguelike · Side Scroller · Hack and Slash

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

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

Dungreed
Shared: Action Roguelike · Roguelite · Dungeon Crawler

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Dungeon Crawler · Difficult

Noita
Shared: Dungeon Crawler · Difficult · Roguelike

Moonlighter
Shared: Hack and Slash · Roguelite · Action Roguelike

Anomaly Agent
Shared: Side Scroller · Action Roguelike · Hack and Slash

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

Rogue Legacy
Shared: Action Roguelike · Platformer · Roguelike

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

Enter the Gungeon
Shared: Action Roguelike · Dungeon Crawler · Difficult

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

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

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

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

Megabonk
Shared: Action Roguelike · Roguelite · Roguelike

Death Must Die
Shared: Action Roguelike · Roguelite · Hack and Slash

UnderMine
Shared: Action Roguelike · Roguelite · Dungeon Crawler

Roguelands
Shared: Action Roguelike · Roguelike · Roguelite

Garden of Witches
Shared: Action Roguelike · Roguelite · Hack and Slash

Vagante
Shared: Action Roguelike · Roguelite · Difficult