Games like Flame Keeper
Games like Flame Keeper include Hades, Hades II, Skul: The Hero Slayer, Megabonk, and Vampire Survivors. We matched them by the tags players give Flame Keeper on Steam (Roguelite, Action Roguelike, Cute, Hack and Slash, and Action): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Roguelite · Action Roguelike · Hack and Slash

Hades II
Shared: Roguelite · Action · Hack and Slash

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

Megabonk
Shared: Action Roguelike · Roguelite · Indie

Vampire Survivors
Shared: Action Roguelike · Roguelite · Indie

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

Sephiria
Shared: Roguelite · Action Roguelike · Action

Cult of the Lamb
Shared: Action Roguelike · Cute · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Roguelite · Hack and Slash

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

Ravenswatch
Shared: Action Roguelike · Roguelite · Action

Halls of Torment
Shared: Roguelite · Action Roguelike · Action

Brotato
Shared: Action Roguelike · Singleplayer · Roguelite

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

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

Realm of Ink
Shared: Roguelite · Action Roguelike · Hack and Slash

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

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

Jotunnslayer: Hordes of Hel
Shared: Action Roguelike · Roguelite · Hack and Slash

Touhou Dystopian
Shared: Action Roguelike · Roguelite · Action

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

Rogue Legacy
Shared: Action Roguelike · Action · Indie

Moonlighter
Shared: Roguelite · Hack and Slash · Action Roguelike

Windblown
Shared: Action Roguelike · Roguelite · Hack and Slash