Games like Junkster
Games like Junkster include A Hat in Time, Pumpkin Jack, Psychonauts, TY the Tasmanian Tiger, and Portal 2. We matched them by the tags players give Junkster on Steam (Singleplayer, 3D Platformer, Collectathon, Funny, and Adventure): closest matches first, and among equally close ones the better-known games.

A Hat in Time
Shared: 3D Platformer · Collectathon · Funny

Pumpkin Jack
Shared: 3D Platformer · Adventure · Collectathon

Psychonauts
Shared: Singleplayer · Adventure · 3D Platformer

TY the Tasmanian Tiger
Shared: 3D Platformer · Collectathon · Adventure

Portal 2
Shared: Singleplayer · Platformer · Funny

Psychonauts 2
Shared: 3D Platformer · Singleplayer · Adventure

Ratchet & Clank: Rift Apart
Shared: Singleplayer · 3D Platformer · Adventure

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

Spyro™ Reignited Trilogy
Shared: 3D Platformer · Adventure · Singleplayer

Crash Bandicoot™ N. Sane Trilogy
Shared: 3D Platformer · Singleplayer · Platformer

Yellow Taxi Goes Vroom
Shared: Singleplayer · 3D Platformer · Indie

Portal
Shared: 3D Platformer · Singleplayer · Funny

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

SpongeBob SquarePants: The Cosmic Shake
Shared: 3D Platformer · Singleplayer · Platformer

Pizza Tower
Shared: Funny · Indie · Singleplayer

Sonic Lost World
Shared: 3D Platformer · Singleplayer · Adventure

Get To Work
Shared: Singleplayer · Adventure · Funny

SpongeBob SquarePants: Titans of the Tide
Shared: 3D Platformer · Adventure · Funny

Crash Bandicoot™ 4: It’s About Time
Shared: 3D Platformer · Singleplayer · Adventure

SpongeBob SquarePants: Battle for Bikini Bottom - Rehydrated
Shared: 3D Platformer · Adventure · Funny

Sonic Adventure DX
Shared: 3D Platformer · Singleplayer · Adventure

Bully: Scholarship Edition
Shared: Singleplayer · Adventure · Funny

Sonic Adventure 2
Shared: 3D Platformer · Singleplayer · Adventure

Sonic Frontiers
Shared: 3D Platformer · Singleplayer · Adventure