Multiplayer shoot em up games for Xbox 360 with 2-player support

Ugly Americans: Apocalypsegeddon

Players: 4 local, 4 online

DoDonPachi Resurrection

Players: 2 local, 0 online

Geometry Wars: Retro Evolved 2

Players: 4 local, 0 online

Bullet Soul

Players: 2 local, 0 online

Ikaruga

Players: 2 local, 2 online

Otomedius Excellent

Players: 3 local, 3 online

Shoot Many Robots

Players: 2 local, 4 online

Espgaluda II Black Label

Players: 2 local, 0 online

Trouble Witches Neo

Players: 2 local, 2 online

Aegis Wing

Players: 4 local, 4 online

Raiden IV

Players: 2 local, 0 online

Radiant Silvergun

Players: 2 local, 2 online

1942: Joint Strike

Players: 2 local, 2 online

Deathsmiles

Players: 2 local, 2 online

Raiden Fighters Aces

Players: 2 local, 0 online

Akai Katana

Players: 2 local, 0 online

Platypus

Players: 2 local, 0 online

Strania - The Stella Machina

Players: 2 local, 2 online

Scramble

Players: 2 local, 2 online

Guwange

Players: 2 local, 2 online

Radirgy Noa Massive

Players: 2 local, 0 online

Bangai-O HD: Missile Fury

Players: 0 local, 2 online

KOF Sky Stage

Players: 2 local, 0 online

Raystorm HD

Players: 2 local, 0 online

Under Defeat HD: Deluxe Edition

Players: 2 local, 0 online