Games like Freon
Games like Freon include Brawlhalla, PUBG: BATTLEGROUNDS, Grand Theft Auto V Legacy, Marvel Rivals, and ARC Raiders. We matched them by the tags players give Freon on Steam (Side Scroller, 2D Platformer, Third-Person Shooter, Parkour, and Platformer): closest matches first, and among equally close ones the better-known games.

Brawlhalla
Shared: 2D Platformer · 2D Fighter · Platformer

PUBG: BATTLEGROUNDS
Shared: Shooter · Third-Person Shooter · PvP

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

Marvel Rivals
Shared: Third-Person Shooter · PvP · Shooter

ARC Raiders
Shared: Third-Person Shooter · PvP · Shooter

Watch_Dogs® 2
Shared: Parkour · Shooter · Third-Person Shooter

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Platformer

Gears 5
Shared: Third-Person Shooter · Shooter · Action

Pixel Gun 3D: PC Edition
Shared: PvP · Shooter · Character Customization

Broforce
Shared: Platformer · Side Scroller · Shooter

Rogue Company
Shared: Third-Person Shooter · Shooter · PvP

Just Cause™ 3
Shared: Third-Person Shooter · Shooter · Action

Tomb Raider Game of the Year
Shared: Third-Person Shooter · Third Person · Adventure

Sunset Overdrive
Shared: Parkour · Third-Person Shooter · Character Customization

Warhammer 40,000: Shootas, Blood & Teef
Shared: Side Scroller · 2D Platformer · PvP

Watch_Dogs™
Shared: Third-Person Shooter · Third Person · Shooter

HELLDIVERS™ 2
Shared: Third-Person Shooter · Shooter · Action

Red Dead Redemption 2
Shared: Shooter · Third-Person Shooter · PvP

Street Fighter™ 6
Shared: 2D Fighter · PvP · Character Customization

Warframe
Shared: Third-Person Shooter · Third Person · Character Customization

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Third-Person Shooter · Shooter · Action

My Friend Pedro
Shared: Parkour · Shooter · Side Scroller

Risk of Rain 2
Shared: Third-Person Shooter · Shooter · PvP

NARAKA: BLADEPOINT
Shared: PvP · Character Customization · Action