Question: The video game Ziggurat  is largely inspired by a 1994 game developed by what company?
Context: Xenonauts is a turn-based science fiction video game developed and published as the maiden title of London-based independent game studio Goldhawk Interactive.  Inspired by the 1994 game "" (Called "X-COM: UFO Defense" in North America), gameplay involves the player taking the role of the commander of a clandestine organization known as the Xenonauts, and attempting to defeat an alien invasion of Earth in the alternate history year 1979.  The game was released on June 17, 2014 for Microsoft Windows.  Ports to Mac OS X and Linux were initially based on the Wine compatibility layer, until native ports became available in September 2015. Ziggurat is a first-person shooter dungeon crawl video game developed and published by Milkstone Studios.  The game was released for Linux, Microsoft Windows, and OS X in October 2014 after being available for two months in early access.  The game was later released for the Xbox One in March 2015, and the PlayStation 4 in April 2015.  The game is largely inspired by "Heretic" and "", classical first-person shooters. Heretic is a dark fantasy first-person shooter video game released in 1994.  It was developed by Raven Software and published by id Software through GT Interactive.  The game was released on Steam on August 3, 2007. Angry Birds is a casual puzzle video game developed by Rovio Entertainment.  Inspired primarily by a sketch of stylized wingless birds, the game was first released for iOS and Maemo devices in December 2009.  Since that time, over 12 million copies of the game have been purchased from the iOS App Store, which has prompted the company to design versions for other touchscreen-based smartphones, most notably those using the Android, Symbian, Windows Phone and BlackBerry 10 devices.  The series has since expanded to include titles for dedicated video game consoles and for PCs.  A sequel, titled "Angry Birds 2", was released in July 2015. Pokémon Emerald (ポケットモンスター　エメラルド , Poketto Monsutā Emerarudo, , "Pocket Monsters Emerald") , is a role-playing video game developed by Game Freak, published by The Pokémon Company and distributed by Nintendo for the Game Boy Advance handheld video game console.  It was first released in Japan on September 16, 2004, and was later released in North America, Australia, and Europe.  It is an enhanced version of "Pokémon Ruby" and "Sapphire", and is part of the third generation of the "Pokémon" video game series. Solar 2 is an open world sandbox video game developed by Jay Watts' video game studio, Murudai.  It was released on 17 June 2011 on Steam for Microsoft Windows and on 19 June 2011 on Xbox Live Indie Games for the Xbox 360.  The game was developed with Microsoft's XNA tools, and its development was inspired by indie games such as flOw.  The game follows the player in their mission to accumulate enough mass to become several astronomical objects, eventually becoming a big crunch, which then produces a Big Bang. Metroid Fusion is an action-adventure video game published by Nintendo for the Game Boy Advance handheld game console.  The fourth installment in the "Metroid" series, it was developed by the company's Research & Development 1 (R&D1) division— the same team that previously developed the 1994 game "Super Metroid", to which "Fusion" bears heavy resemblance.  It was released in North America, Europe, and Australia in November 2002, and in Japan in February 2003. Ziggurat, stylized as ZiGGURAT, is a retro-style arcade shooter video game developed by Action Button Entertainment for iOS platforms.  As the world's last human fighting off incoming alien freaks from atop a ziggurat, the player uses touch controls to charge and shoot the enemies away, and dies if hit by an enemy.  The game has 16-bit graphics style and an 8-bit chiptune soundtrack.  Action Button designer Tim Rogers developed the game idea based on his experience with "Angry Birds", which later led to his forming Action Button as a company with "Ziggurat" as its first release on February 17, 2012. Resident Evil 3: Nemesis is a survival horror video game developed by Capcom and originally released for the PlayStation video game console in 1999.  It is the third installment in the "Resident Evil" video game series and takes place before and after the events of "Resident Evil 2".  The story of the game follows "Resident Evil" protagonist Jill Valentine and her efforts to escape from a city that has been infected with a new type of biological weapon secretly developed by the pharmaceutical company Umbrella. Game Dev Story is a simulation video game developed and published by Kairosoft for Microsoft Windows, iOS, and Android.  It was released for Windows in April of 1997 , for iOS and Android on October 9, 2010, and for Windows Phone on July 6, 2015.  The game follows a player-controlled video game company and its attempts to expand into a sales powerhouse over time.  As a simulation, the game and the direction of the company is controlled by the player, following a parallel timeline of the video game industry and its history.  The game was released to positive reviews, with many reviewers focusing on "Game Dev Story"' s addictive aspects and its witty references to video game pop culture.
Answer: Raven Software