Games like jUMp!
Games like jUMp! include Only Climb: Better Together, ALTF4, Geometry Dash, Sonic Adventure 2, and Refunct. We matched them by the tags players give jUMp! on Steam (Precision Platformer, 3D Platformer, Casual, Platformer, and Action): closest matches first, and among equally close ones the better-known games.

Only Climb: Better Together
Shared: Precision Platformer · 3D Platformer · Platformer

ALTF4
Shared: 3D Platformer · Action · Platformer

Geometry Dash
Shared: Precision Platformer · Platformer · Character Customization

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

Refunct
Shared: 3D Platformer · Casual · Platformer

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

The Big Catch: Tacklebox
Shared: 3D Platformer · Action · Precision Platformer

Portal 2
Shared: Platformer · 3D Platformer · Singleplayer

Neon White
Shared: 3D Platformer · Platformer · Action

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

Superflight
Shared: Casual · Relaxing · Action

Chained Together
Shared: Casual · Platformer · 3D Platformer

LOST EGG 2: Be together
Shared: Precision Platformer · 3D Platformer · Platformer

Pumpkin Jack
Shared: 3D Platformer · Action · Platformer

Downwell
Shared: Precision Platformer · Platformer · Arcade

A Difficult Game About Climbing
Shared: Precision Platformer · Platformer · Action

Sonic Forces
Shared: 3D Platformer · Character Customization · Action

BETON BRUTAL
Shared: 3D Platformer · Precision Platformer · Casual

VHOLUME
Shared: 3D Platformer · Platformer · Casual

Marble It Up! Ultra
Shared: 3D Platformer · Platformer · Arcade

Portal
Shared: 3D Platformer · Action · Singleplayer

Get To Work
Shared: Precision Platformer · 3D Platformer · Action

Sonic Frontiers
Shared: 3D Platformer · Action · Platformer

Psychonauts
Shared: Platformer · 3D Platformer · Action