SHOOT EM UP/SHOOTER

Alien Breed - Sci-Fi Retro Shooter (Android) & Remakes
Ascension - Horror Side Scroller
Atomhex - (gridwars creator) - [ Shoot em up ]
Aqua Kitty - Milk Mine Defender : Shoot em Up
Astro Avenger 2 - [ Brilliant Shoot em up ]
Deadly 30 - Gore Zombie Shooter
Ether Vapor: Remaster - 3D Shoot em up
Fire Arrow - Shoot em up
Flowstorm - arcade racing and aerial combat game with a kickstarter
Fortress Magnus - Flash Shoot em up
Galaxy on Fire 2 HD - Freelancer Style Space Shooter
Galaxy In Flames : The Crucible- Asteroids for the new generation
Gravitron 2 - [ PC Thrust style Game ]
Hotline Miami - Brutal Top Down action
Humans Must Answer - HQ Shoot Em Up
Humans Must Answer - Side Scrolling Shoot em up (kickstarter)
Insanely Twisted Shadow Planet - Bafta Winning Space Shooter
JamesTown - High Quality Shooter!
Jets'n'Guns Gold - Recommended [ Shoot em up ]
INFINOS - Freeware Retro shoot em up
Intrusion 2 - Flash Based Shooter, Metal Slug Clone
luftrauser - Epic soundtrack shoot em up
Leave Home - Shoot em up (Pay what you want)
Lone Survivor - Survival Horror Shooter
MAN VS THE WORLD - Shoot em up with a difference!
Medal Wars - isometric shooter
Metacell - 2D twitch puzzle shooter
Millenipede - inspired by the classic Atari game 
Nemesis Online - Retro Online Shoot em Up
Omnicron - Shoot em up
Orbitron : Revolution - HQ Shoot em up
Omegalodon - Fun looking Multiplayer Action Game
Procyon - Shoot em up
RAIDEN LEGACY - four-title Shoot em up compilation for Apple Io's Devices
Retro City Rampage - GTA Nes Style
RetroBooster - multi-directional arcade shooter
Rhythm Destruction - Rythm Shoot em up
Run and Gun - Shooter from Wizorb Creators
[INDIE] Running with Rifles - think Counter Strike meets Cannon Fodder
Recruits - Single and Co-Op Cannon Fodder Shooter
Retrobooster - Multi-Directional Shoot em up in the style of Thrust!
Serious Sam : The Random Encounter - Shooter
Sine Mora - epic Shoot em up on steam! 
Soldner X - High quality Indy Shoot em up + coop
Splatter - Top Down Gore Shooter
Starlight Inception
Star Defender 3 - Shoot em up * Free Game*
Star Serpent Sigma - High Quality Flash Shoot em up
Sword of Orion - FLASH Shoot em up
Syder Arcade - Insane High Quality Shoot em up!
Team Fortress Arcade - Action
The Tale of ALLTYNEX - Shoot Em Up trilogy (Kickstarter)
The Inflicted : A battle for sanity - Horror Top down action 
Ultratron - Arena Shooter
Verminest - Galaga based shoot em up
Waves - Geometry Wars clone
Xevious ( Retro Shoot em up Remake )
zX HyperBlast, some reckless fun (Shoot Em Up)