Games like Gemstone Keeper
Games like Gemstone Keeper include Skul: The Hero Slayer, Relic Hunters Zero: Remix, Enter the Gungeon, Dead Cells, and Cyberhunt. We matched them by the tags players give Gemstone Keeper on Steam (Indie, Action, Adventure, Twin Stick Shooter, and Roguelike): closest matches first, and among equally close ones the better-known games.

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

Relic Hunters Zero: Remix
Shared: Action · Twin Stick Shooter · Adventure

Enter the Gungeon
Shared: Roguelike · Indie · Twin Stick Shooter

Dead Cells
Shared: Adventure · Roguelike · 2D

Cyberhunt
Shared: Indie · Action · Adventure

Noita
Shared: Roguelike · Indie · 2D

The Binding of Isaac
Shared: Indie · Roguelike · Action

SYNTHETIK: Legion Rising
Shared: Indie · Action · Top-Down Shooter

Rogue Legacy
Shared: Indie · Action · Roguelike

Nuclear Throne
Shared: Indie · Roguelike · Action

ScourgeBringer
Shared: Indie · Action · Adventure

Juicy Realm
Shared: Indie · Action · Adventure

The Ascent
Shared: Action · Top-Down Shooter · Indie

Dust: An Elysian Tail
Shared: Action · Indie · Adventure

Rogue Legacy 2
Shared: Action · Indie · Adventure

ICEY
Shared: Action · Indie · Adventure

Magicite
Shared: Indie · Roguelike · Adventure

Splatter - Zombiecalypse Now
Shared: Action · Indie · Top-Down Shooter

SANABI
Shared: Action · Adventure · Indie

Dungeon Munchies
Shared: Indie · Action · Adventure

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

Spelunky
Shared: Indie · Roguelike · 2D

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

Escape From Duckov
Shared: Action · Adventure · Top-Down Shooter