Multiplayer twin stick shooter games for PC/Windows with 2-player support

ProtoGalaxy

Players: 4 local, 4 online

Narco Terror

Players: 2 local, 2 online

All Zombies Must Die!

Players: 4 local, 0 online

Dual Core

Players: 4 local, 4 online

TwinCop

Players: 2 local, 0 online

JYDGE

Players: 2 local, 0 online

When It Hits the Fan

Players: 2 local, 0 online

Vicious Attack Llama Apocalypse

Players: 4 local, 0 online

Vectorium

Players: 2 local, 0 online

SCALPERS: Turtle and the Moonshine Gang

Players: 4 local, 4 online

HELLFRONT: HONEYMOON

Players: 2 local, 0 online

The Walking Vegetables

Players: 2 local, 0 online

NoReload Heroes

Players: 4 local, 4 online

Null Vector

Players: 2 local, 0 online

ORE

Players: 4 local, 0 online

Last Encounter

Players: 4 local, 0 online

Galaxy Champions TV

Players: 2 local, 0 online

Gerty

Players: 4 local, 0 online

Aperion Cyberstorm

Players: 5 local, 0 online

Deadstone

Players: 2 local, 0 online

Obludia

Players: 2 local, 0 online

Geometry Wars 3: Dimensions

Players: 4 local, 0 online

A Quiver of Crows

Players: 2 local, 0 online

AIPD

Players: 4 local, 0 online

SUPERVERSE

Players: 4 local, 0 online