Games like 100 vacas
Games like 100 vacas include Vampire Survivors, Windowkill, Exit the Gungeon, LUFTRAUSERS, and Broforce. We matched them by the tags players give 100 vacas on Steam (Action, Western, Minimalist, Twin Stick Shooter, and Arcade): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · 2D

Windowkill
Shared: Action · Arcade · Twin Stick Shooter

Exit the Gungeon
Shared: Action · Arcade · Bullet Hell

LUFTRAUSERS
Shared: Action · Arcade · Bullet Hell

Broforce
Shared: Action · Pixel Graphics · 2D

Bit Blaster XL
Shared: Bullet Hell · Action · Arcade

Enter the Gungeon
Shared: Bullet Hell · Pixel Graphics · Twin Stick Shooter

Planes, Bullets and Vodka
Shared: Action · Arcade · Bullet Hell

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Kill The Crows
Shared: Action · Western · Arcade

Call of Juarez: Gunslinger
Shared: Western · Action · Shooter

Red Dead Redemption 2
Shared: Western · Action · Shooter

UBERMOSH
Shared: Action · Arcade · Pixel Graphics

12 is Better Than 6
Shared: Action · Western · Shooter

Cyberhunt
Shared: Action · Twin Stick Shooter · Arcade

Geometry Wars: Retro Evolved
Shared: Twin Stick Shooter · Arcade · Bullet Hell

UBERMOSH Vol.5
Shared: Action · Arcade · Bullet Hell

ZeroRanger
Shared: Action · Bullet Hell · Arcade

METAL SLUG
Shared: Action · Arcade · 2D

Duck Game
Shared: Action · Pixel Graphics · 2D

UBERMOSH Vol.3
Shared: Action · Arcade · Twin Stick Shooter

Mirage Feathers
Shared: Bullet Hell · Action · Cute

SUPER CHICKEN JUMPER
Shared: Arcade · 2D · Action

UFO 50
Shared: Action · Arcade · Pixel Graphics