Plot: Alien Shooter is an isometric, top-down shooter video game developed and released by Sigma Team, a Russian games development studio. Released on May 18, 2003, it was initially available on Microsoft Windows, iOS, and Android. Wikipedia
Plot: Space Invaders is a Japanese shooting video game released in 1978 by Taito. It was developed by Tomohiro Nishikado, who was inspired by other media: Breakout, The War of the Worlds, and Star Wars. Wikipedia