Games like Kwark
Games like Kwark include A Story About My Uncle, Portal 2, Refunct, Brawlhalla, and Pumpkin Jack. We matched them by the tags players give Kwark on Steam (Casual, Action, Free to Play, Platformer, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

A Story About My Uncle
Shared: Indie · Platformer · First-Person

Portal 2
Shared: Platformer · First-Person · 3D Platformer

Refunct
Shared: 3D Platformer · Casual · Platformer

Brawlhalla
Shared: Free to Play · Casual · Platformer

Pumpkin Jack
Shared: Action · 3D Platformer · Indie

Chained Together
Shared: Casual · Platformer · 3D Platformer

Marvel Rivals
Shared: Free to Play · Action · Casual

Aimlabs
Shared: Free to Play · Action · First-Person

Warframe
Shared: Free to Play · Action · Third Person

VHOLUME
Shared: Casual · 3D Platformer · Platformer

Clustertruck
Shared: Action · 3D Platformer · First-Person

Neon White
Shared: 3D Platformer · Action · Platformer

Where Winds Meet
Shared: Free to Play · Casual · Indie

SMITE®
Shared: Free to Play · Action · Third Person

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

Portal
Shared: 3D Platformer · First-Person · Action

Wuthering Waves
Shared: Free to Play · Action · 3D

LIMBO
Shared: Platformer · Indie · Atmospheric

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

Sonic Frontiers
Shared: Action · 3D Platformer · Platformer

Planet of Lana
Shared: Action · Platformer · Indie

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

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

Minimalism
Shared: Casual · Action · Indie