Games like Square Massacre
Games like Square Massacre include Hotline Miami, RUINER, Hotline Miami 2: Wrong Number, The Hong Kong Massacre, and My Friend Pedro. We matched them by the tags players give Square Massacre on Steam (Action, Indie, Gore, Top-Down Shooter, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

Hotline Miami
Shared: Action · Indie · Gore

RUINER
Shared: Action · Top-Down Shooter · Indie

Hotline Miami 2: Wrong Number
Shared: Gore · Action · Indie

The Hong Kong Massacre
Shared: Action · Gore · Indie

My Friend Pedro
Shared: Action · Indie · Gore

Nation Red
Shared: Action · Indie · Top-Down Shooter

12 is Better Than 6
Shared: Action · Top-Down Shooter · Indie

CARRION
Shared: Gore · Action · Indie

The Ascent
Shared: Top-Down Shooter · Action · Indie

Chivalry: Medieval Warfare
Shared: Action · Gore · Indie

Crimsonland
Shared: Action · Gore · Indie

Guns, Gore & Cannoli
Shared: Action · Gore · Indie

SYNTHETIK: Legion Rising
Shared: Indie · Action · Top-Down Shooter

Suit for Hire
Shared: Action · Gore · Top-Down Shooter

Bright Memory: Infinite
Shared: Action · Indie · Gore

Ape Out
Shared: Indie · Gore · Action

Battle Bruise
Shared: Action · Indie · Gore

BALL x PIT
Shared: Action · Shoot 'Em Up · Top-Down Shooter

Cyberhunt
Shared: Action · Indie · Shoot 'Em Up

UBERMOSH Vol.5
Shared: Action · Indie · Top-Down Shooter

Valfaris
Shared: Action · Indie · Gore

Sky Force Reloaded
Shared: Shoot 'Em Up · Top-Down Shooter · Action

Iron Snout
Shared: Action · Gore · Indie

Serious Sam Fusion 2017 (beta)
Shared: Action · Gore · Indie