Multiplayer shoot em up games for PC/Windows with 2-player support

Shoot 1UP

Players: 2 local, 0 online

Pixel Galaxy

Players: 2 local, 0 online

Spareware

Players: 4 local, 0 online

Overdriven Reloaded

Players: 4 local, 0 online

Dariusburst: Chronicle Saviours

Players: 4 local, 0 online

The Bug Butcher

Players: 2 local, 0 online

Stardust Galaxy Warriors: Stellar Climax

Players: 4 local, 0 online

Xenoraid

Players: 4 local, 0 online

Sky Force Anniversary

Players: 2 local, 0 online

Shock Troopers

Players: 2 local, 2 online

Last Resort

Players: 2 local, 0 online

Aero Fighters 3

Players: 2 local, 0 online

Steel Rain

Players: 2 local, 0 online

Ghost Blade HD

Players: 2 local, 0 online

RiftStar Raiders

Players: 0 local, 4 online

Nighthaw-X3000

Players: 2 local, 0 online

Sine Mora EX

Players: 2 local, 0 online

Zed Blade

Players: 2 local, 0 online

Strikers 1945 Plus

Players: 2 local, 0 online

Strikers 1945 II

Players: 2 local, 0 online

Aqua Kitty - Milk Mine Defender

Players: 2 local, 0 online

Dimension Drive

Players: 2 local, 0 online

Bullet Soul Infinite Burst

Players: 2 local, 0 online

Strikers 1945

Players: 2 local, 0 online

Prehistoric Isle 2

Players: 2 local, 0 online