Mok Force is a japanese vertically shmup with procedurally generated stages.

Link to Official Site (Download or play the game online)

Link to Author Site

Major Hertz is a third person 80′s badass simulator built in Unity3d, where the player shoots, boosts, and ignores gravity to proclaim their manly dominance against the evil Onyx Cross in the center of a raging space battle.

Major Hertz was created by 5 students from Vancouver Film School’s Game Design program over a 3 month development cycle. More info on the Authors can be found on the official page.

Link to Official Site

System Requirements

Operating System: Windows® XP SP2 or later;
Processor: 2.6 GHz minimum (3.0 GHz or higher recommended)
Memory: 1 GB RAM minimum (2GB or higher recommended)
Software: None
Hard Disk Space: 2 GB free
Video: Graphics card with DirectX 9.0 level (shader model 2.0) capabilities or better
Sound: Windows® or Mac OSX® compatible sound card

(Some Intel GPUs may not support Occlusion Query support necessary for running the game.)

This is a game made by the korean developer Gustav, a parody shmup game of DoDonPachi.

Link to Official Site

Vexillum is a free multiplayer Capture the Flag game with guns, swords, and ninja rope! Work together with your team to capture the enemy’s flag while protecting yours. Destroyable terrain and multiple weapon types ensure that every match will be different. Make custom maps and host your own server for maximum fun!

Link to Official Site

Xeno Fighters R is a tribute fangame to the Raiden Fighters series of top-down scrolling shooters by SEIBU KAIHATSU INC. It also incorporates a few elements from games by Psikyo, Raizing/8ing, and Cave.

Visit the Official Site

The game boasts a roster of playable original ships, such as the balanced Amada Vipros, the fast Phyxius, the damage-dealing Zaiva, and the finesse Xelcor. It also features a varied array of guest fighters, serving as cameos from other SHMUP games, both well known and obscure. There is even a certain dual-type Electric/Flying Legendary Pokémon that appears as a guest fighter.

Fire arrow is a short, timed survival/caravan shmup that can be played in 3 or 5 minute modes. In 3 minute mode, you get roughly half the stage and 1 boss, while in 5 you have 2 bosses to fight. The game will also look for songs (.mod/.s3m/.it etc.) in the music folder on startup, so feel free to use your own favorites if you don’t like the music included with the game.

Visit the Author Site

Previously sold for a couple of bucks, Megatank has been released for free by its author Gryzor. It’s a simple arena shoot-em-up with 2 challenging levels.

Visit the Author Site

Controls:
WSAD – move turret
Arrows – move tank
O – change screen size

Shadow Clones is 3D top-down shooter game, similar to games like Alien Breed, Alien Shooter or Shadow Grounds. The protagonist is nameless starship commando whose mission is to maintain order on unspecified military base on Mars. Order has been broken by blood-starving monsters and it is your task to battle a lone fight in sci-fi interiors of starship military base.

Link to Author Site (polish language)

If you like this type of game, i strongly suggest to try Alien Swarm

CLR is a free-to-play cross-platform multiplayer PvP/Co-op arcade space game. CLR provides 2D spaceship combat in 3D environment, wide variety of combat roles fitting different playing styles (achieved by selecting one of many starships and further customizing it with enhancements), and both Individual and clan-based gameplay. Join your friends and shoot lasers at your opponents! Become a brave star pilot and fight other pilots for gold, for glory and for fun!

Release Date: March 2013 (probably)

Link to Steam GreenLight Page

Man Vs. The World is a side-scrolling shooter that contains platforming elements. You leap from your ship and steal other ships.

Visit the Official Site