Galaxian Heroes (partially found unreleased video game; existence unconfirmed; 2015)
Galaxian Heroes is the name of an unreleased video game in development by Project Aces, an internal development division within Bandai Namco Entertainment that is best known for creating the Ace Combat series. It was to utilize a game engine featured in an earlier Ace Combat game, but it is unknown which one it would have used specifically. Believed to be based on Namco's Galaxian series, it is assumed to be a space combat simulation game in the style of titles such as Star Ixiom (1999).
The game was mentioned in a tweet made by Ace Combat series producer Kazutoki Kono on March 11th, 2015, where he revealed that a track contained in the soundtrack album Ace Combat Infinity & Series Music Best, titled "GH" and composed by Keiki Kobayashi, was used in an unreleased trailer for Galaxian Heroes. Kono released a teaser image for the game on April 1.
All other information regarding the game, including if it is even still in production or not, is being kept a closely-guarded secret by Project Aces. Its existence has come under question by some dedicated Ace Combat fan communities for its scarce amount of info, and for the teaser image being uploaded on April 1st.