Games like Heli-Cats
Games like Heli-Cats include Broforce, Huntdown, Cuphead, METAL SLUG X, and Blazing Chrome. We matched them by the tags players give Heli-Cats on Steam (Shoot 'Em Up, Action, Local Co-Op, Pixel Graphics, and Difficult): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · Pixel Graphics · Local Co-Op

Huntdown
Shared: Pixel Graphics · Action · Shoot 'Em Up

Cuphead
Shared: Difficult · Local Co-Op · 2D

METAL SLUG X
Shared: Action · Shoot 'Em Up · Arcade

Blazing Chrome
Shared: Action · Pixel Graphics · Shoot 'Em Up

METAL SLUG 3
Shared: Action · Arcade · Local Co-Op

METAL SLUG
Shared: Action · Shoot 'Em Up · Arcade

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Action · 2D

Vampire Survivors
Shared: Pixel Graphics · 2D · Action

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

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · 2D

METAL SLUG 2
Shared: Action · Shoot 'Em Up · Arcade

LUFTRAUSERS
Shared: Action · Shoot 'Em Up · Pixel Graphics

ZeroRanger
Shared: Shoot 'Em Up · Action · Pixel Graphics

UFO 50
Shared: Action · Pixel Graphics · Arcade

Streets of Rage 4
Shared: Action · 2D · Arcade

Contra Anniversary Collection
Shared: Action · Side Scroller · 2D

SANABI
Shared: Action · Pixel Graphics · 2D

Enter the Gungeon
Shared: Pixel Graphics · Difficult · Local Co-Op

Fight'N Rage
Shared: Action · Local Co-Op · 2D

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

The Binding of Isaac: Rebirth
Shared: Difficult · Pixel Graphics · Local Co-Op

Timberman
Shared: Pixel Graphics · Action · 2D

Bloodstained: Curse of the Moon
Shared: Action · Pixel Graphics · Side Scroller