Games like Burrow Mayhem
Games like Burrow Mayhem include Broforce, THE FINALS, Stick Fight: The Game, Streets of Rage 4, and Guns, Gore & Cannoli. We matched them by the tags players give Burrow Mayhem on Steam (Arena Shooter, Side Scroller, Twin Stick Shooter, Action, and Shooter): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · 2D · Side Scroller

THE FINALS
Shared: PvP · Shooter · Action

Stick Fight: The Game
Shared: Action · Funny · PvP

Streets of Rage 4
Shared: Action · Side Scroller · 2D

Guns, Gore & Cannoli
Shared: Side Scroller · Action · 2D

Strike Force Heroes
Shared: Arena Shooter · Action · Shooter

Pixel Gun 3D: PC Edition
Shared: PvP · Action · Shooter

My Friend Pedro
Shared: Action · Shooter · Side Scroller

METAL SLUG
Shared: Action · Side Scroller · Arcade

Apewar
Shared: Action · Arena Shooter · Shooter

Alex Jones: NWO Wars
Shared: Action · Side Scroller · Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · PvP · Action

Deployment
Shared: Arena Shooter · Action · Twin Stick Shooter

Duck Game
Shared: Action · Funny · 2D

Titan Attacks!
Shared: Arena Shooter · Side Scroller · Twin Stick Shooter

Shotgun Farmers
Shared: Action · Shooter · Arena Shooter

ShellShock Live
Shared: Action · 2D · Shooter

The Mean Greens - Plastic Warfare
Shared: Action · Shooter · Funny

Warhammer 40,000: Shootas, Blood & Teef
Shared: Side Scroller · PvP · Twin Stick Shooter

Grand Theft Auto V Legacy
Shared: Action · Shooter · PvP

UpGun
Shared: Shooter · PvP · Arena Shooter

BRAZILIAN DRUG DEALER 3: I OPENED A PORTAL TO HELL IN THE FAVELA TRYING TO REVIVE MIT AIA I NEED TO CLOSE IT
Shared: Arena Shooter · PvP · Shooter

METAL SLUG 3
Shared: Action · Side Scroller · Arcade

Huntdown
Shared: Side Scroller · Action · Shooter