Multiplayer shoot em up games with 4-player local/couch support

Mercenary Kings

Players: 4 local, 0 online

Netherspace 2

Players: 0 local, 0 online

Airstrife: Assault of the Aviators

Players: 0 local, 0 online

Score Rush

Players: 0 local, 0 online

Overdriven

Players: 0 local, 0 online

Ugly Americans: Apocalypsegeddon

Players: 4 local, 360 online

Jamestown

Players: 0 local, 0 online

Mercenary Kings

Players: 4 local, 0 online

Geometry Wars: Retro Evolved 2

Players: 0 local, 360 online

Mercenary Kings

Players: 4 local, 0 online

Decimation X3

Players: 0 local, 0 online

Ugly Americans: Apocalypsegeddon

Players: 4 local, 0 online

Jamestown

Players: 0 local, 0 online

Aegis Wing

Players: 4 local, 360 online

Zytron II

Players: 0 local, 0 online

1993 Space Machine

Players: 0 local, 0 online

Decimation X

Players: 0 local, 0 online

Aces of the Luftwaffe - Squadron

Players: 0 local, 0 online

Giga Wing 2

Players: 0 local, 0 online

Rise of the Ravager

Players: 0 local, 0 online

Dariusburst: Another Chronicle

Players: 0 local, 0 online

Aether Drift

Players: 0 local, 0 online

Retrobooster

Players: 0 local, 0 online

Friendship Club

Players: 0 local, 0 online

Spareware

Players: 0 local, 0 online