Games like TwinCop
Games like TwinCop include Hotline Miami, Hotline Miami 2: Wrong Number, Broforce, RUINER, and The Ascent. We matched them by the tags players give TwinCop on Steam (Gore, Indie, Action, Adventure, and Violent): closest matches first, and among equally close ones the better-known games.

Hotline Miami
Shared: Action · Indie · Violent

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

Broforce
Shared: Action · Co-op · Indie

RUINER
Shared: Action · Indie · Gore

The Ascent
Shared: Action · Top-Down Shooter · Co-op

Serious Sam 4
Shared: Gore · Action · Co-op

CARRION
Shared: Gore · Action · Indie

Gears 5
Shared: Action · Adventure · Gore

Mother Russia Bleeds
Shared: Gore · Action · Violent

Enter the Gungeon
Shared: Indie · Local Co-Op · Co-op

My Friend Pedro
Shared: Indie · Action · Gore

Relic Hunters Zero: Remix
Shared: Action · Adventure · Twin Stick Shooter

Nation Red
Shared: Indie · Action · Gore

Redeemer: Enhanced Edition
Shared: Action · Gore · Indie

Charlie Murder
Shared: Indie · Action · Gore

Party Hard
Shared: Indie · Violent · Gore

DOOM Eternal
Shared: Gore · Action · Violent

The Hong Kong Massacre
Shared: Gore · Action · Violent

Blasphemous
Shared: Gore · Indie · Violent

HELLDIVERS™ Dive Harder Edition
Shared: Co-op · Action · Top-Down Shooter

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

Human Fall Flat
Shared: Co-op · Adventure · Action

Paint the Town Red
Shared: Gore · Action · Violent

Splatter - Zombiecalypse Now
Shared: Action · Indie · Top-Down Shooter