Games like Infinity Blaster
Games like Infinity Blaster include Huntdown, Bit Blaster XL, Broforce, Zombotron, and Planes, Bullets and Vodka. We matched them by the tags players give Infinity Blaster on Steam (Side Scroller, Action, Shoot 'Em Up, Shooter, and 2D Fighter): closest matches first, and among equally close ones the better-known games.

Huntdown
Shared: Side Scroller · Action · Shooter

Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Action

Broforce
Shared: Action · Side Scroller · Shooter

Zombotron
Shared: Action · Shooter · 2D

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Casual

Guns, Gore & Cannoli
Shared: Side Scroller · Action · Shoot 'Em Up

Guns, Gore and Cannoli 2
Shared: Side Scroller · Action · Shooter

Soda Crisis
Shared: Side Scroller · Action · Shoot 'Em Up

Your Only Move Is HUSTLE
Shared: Action · 2D Fighter · Side Scroller

METAL SLUG
Shared: Action · Side Scroller · Shoot 'Em Up

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Survival

DRAINUS
Shared: Action · Shoot 'Em Up · Shooter

Intrusion 2
Shared: Action · Shooter · Side Scroller

My Friend Pedro
Shared: Action · Shooter · Side Scroller

Jets'n'Guns 2
Shared: Action · Shoot 'Em Up · Side Scroller

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

Cyberhunt
Shared: Action · Shoot 'Em Up · Casual

Stick Fight: The Game
Shared: Action · 2D Fighter · 2D

ShellShock Live
Shared: Action · Shooter · 2D

METAL SLUG 3
Shared: Action · Side Scroller · Shooter

Contra: Operation Galuga
Shared: Action · Shooter · Side Scroller

Blazing Chrome
Shared: Action · Side Scroller · Shoot 'Em Up

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

Counter-Strike
Shared: Action · Shooter · Tactical