The listing, Steel Invaders(steam key) has ended.
http://store.steampowered.com/app/558620/
An infinitely exciting arcade game
Steel Invaders is a hardcore old school game where you pilot a galactic ship. Time to destroy hundreds of aliens!
Is where to shoot
Steel Invaders has more than 40 levels to complete, many types of weapons and ammunition. And many challenging bosses!
Good old hardcore
Steel Invaders challenges the player at every step. Show yourself in a classic hardcore arcade action!
Lamp graphics and visual design
Visual design in the game is great! And in-game soundtrack, you can feel that in your hands the great legacy of arkadnoj the past!