Games like Proportions
Games like Proportions include Marvel Rivals, s&box, Disney Speedstorm, ALTF4, and Grand Theft Auto V Legacy. We matched them by the tags players give Proportions on Steam (Action, Casual, Arcade, 3D Fighter, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Marvel Rivals
Shared: Action · Third-Person Shooter · Casual

s&box
Shared: Casual · Action · 3D Platformer

Disney Speedstorm
Shared: Action · Arcade · Casual

ALTF4
Shared: Action · 3D Platformer · Arcade

Grand Theft Auto V Legacy
Shared: Action · Third Person · Third-Person Shooter

Timberman
Shared: Casual · Action · Arcade

- Kinki Spiritual Affairs Bureau
Shared: Action · 3D Fighter · Third-Person Shooter

Only Climb: Better Together
Shared: 3D Platformer · Arcade · Casual

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

Crab Champions
Shared: Arcade · Third-Person Shooter · 3D

Megabonk
Shared: Action · Arcade · Casual

Razortron 2000
Shared: Casual · Arcade · Racing

Warframe
Shared: Action · Third-Person Shooter · Third Person

Timberman VS
Shared: Action · Casual · Arcade

Clone Drone in the Danger Zone
Shared: Action · 3D Fighter · Indie

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · Casual · Action

Warhammer 40,000: Space Marine 2
Shared: Action · Third-Person Shooter · Third Person

Gang Beasts
Shared: Action · Casual · Funny

Vampire Survivors
Shared: Casual · Pixel Graphics · Action

MARVEL Tōkon: Fighting Souls
Shared: Action · Casual · Arcade

DRAGON BALL: Sparking! ZERO
Shared: Action · 3D Fighter · 3D

Drift86
Shared: Casual · Arcade · Racing

Planes, Bullets and Vodka
Shared: Action · Casual · Arcade

Ratchet & Clank: Rift Apart
Shared: 3D Platformer · Action · Third Person