Games like Gem Hunter
Games like Gem Hunter include Pumpkin Jack, LIMBO, MO:Astray, Chained Together, and Portal 2. We matched them by the tags players give Gem Hunter on Steam (Action, Adventure, Indie, Platformer, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Pumpkin Jack
Shared: Action · Adventure · Indie

LIMBO
Shared: Indie · Platformer · Puzzle Platformer

MO:Astray
Shared: Action · Indie · Adventure

Chained Together
Shared: Adventure · Platformer · Puzzle Platformer

Portal 2
Shared: Platformer · Puzzle Platformer · 3D Platformer

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

Sonic Adventure 2
Shared: Action · Platformer · Adventure

Hob
Shared: Action · Adventure · Indie

Planet of Lana
Shared: Action · Puzzle Platformer · Adventure

Yooka-Laylee
Shared: Adventure · Indie · 3D Platformer

TY the Tasmanian Tiger
Shared: Action · Platformer · Adventure

Seen
Shared: Indie · Adventure · Action

Sonic Adventure DX
Shared: Platformer · Adventure · Action

Deadlight
Shared: Action · Platformer · Indie

Out There Somewhere
Shared: Platformer · Indie · Adventure

Hollow Knight
Shared: Platformer · Indie · Adventure

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Action · 3D Platformer

Neon White
Shared: Action · 3D Platformer · Platformer

Rogue Legacy 2
Shared: Action · Platformer · Indie

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

Ori and the Will of the Wisps
Shared: Platformer · Action · Adventure

Sonic Frontiers
Shared: Adventure · Action · 3D Platformer

Candleman: The Complete Journey
Shared: Action · Indie · Adventure

Psychonauts
Shared: Adventure · Platformer · Action