Games like Keep Up
Games like Keep Up include ALTF4, A Hat in Time, Phantom Abyss, Last Train Outta' Wormtown, and Haste. We matched them by the tags players give Keep Up on Steam (Action Roguelike, 3D Platformer, Runner, Platformer, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

ALTF4
Shared: Runner · 3D Platformer · Platformer

A Hat in Time
Shared: 3D Platformer · Cute · Platformer

Phantom Abyss
Shared: Action Roguelike · 3D Platformer · Platformer

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

Haste
Shared: 3D Platformer · Runner · Action Roguelike

Montaro
Shared: Cute · Runner · Casual

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

Pumpkin Jack
Shared: 3D Platformer · Action · Platformer

Toree 3D
Shared: 3D Platformer · Platformer · 3D

Spark the Electric Jester 3
Shared: 3D Platformer · Platformer · 3D

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

Neon Echo
Shared: Action Roguelike · 3D Platformer · Platformer

Spyro™ Reignited Trilogy
Shared: 3D Platformer · Platformer · Action

Frogun
Shared: 3D Platformer · Platformer · Cute

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

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

Pseudoregalia
Shared: 3D Platformer · Platformer · 3D

Touhou Dystopian
Shared: Action Roguelike · 3D · Action

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

VHOLUME
Shared: 3D Platformer · Runner · Platformer

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

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

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

ATLYSS
Shared: 3D Platformer · Cute · 3D