Games like Polyjump
Games like Polyjump include Neon White, Pseudoregalia, Pumpkin Jack, Clustertruck, and Last Train Outta' Wormtown. We matched them by the tags players give Polyjump on Steam (Action, Indie, 3D Platformer, Parkour, and Platformer): closest matches first, and among equally close ones the better-known games.

Neon White
Shared: 3D Platformer · Action · Parkour

Pseudoregalia
Shared: 3D Platformer · Parkour · Platformer

Pumpkin Jack
Shared: Action · 3D Platformer · Indie

Clustertruck
Shared: Action · Parkour · 3D Platformer

Last Train Outta' Wormtown
Shared: Action · 3D Platformer · Platformer

Hover
Shared: Action · Parkour · Indie

Haste
Shared: Parkour · 3D Platformer · Action

Bomb Rush Cyberfunk
Shared: Action · 3D Platformer · Parkour

skate.
Shared: Action · Character Customization · Controller

My Friend Pedro
Shared: Action · Indie · Parkour

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

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

Sonic Frontiers
Shared: 3D Platformer · Action · 3D

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

SONIC X SHADOW GENERATIONS
Shared: Action · 3D Platformer · Platformer

Sonic Lost World
Shared: 3D Platformer · Platformer · Action

Only Up: With Friends
Shared: Parkour · Action · 3D Platformer

Prince of Persia: The Forgotten Sands™
Shared: Action · Parkour · Platformer

Cyber Hook
Shared: Indie · 3D Platformer · Action

A Story About My Uncle
Shared: Parkour · Indie · Platformer

Only Climb: Better Together
Shared: 3D Platformer · Platformer · Character Customization

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

TY the Tasmanian Tiger
Shared: 3D Platformer · Action · Platformer

SpeedRunners
Shared: Indie · Action · Platformer