The Japanese magazine Dengeki Playstation has an article on Gakuen (a.k.a. Feveron Gakuen or Feveron School), that the game is still in the works (since 2017).
The story is set in a world where shoot ’em up games have been proven to enhance human abilities. National policy promotes the introduction of shoot ’em up games in all training methods, including academics and club activities. On the other hand, the concept of “enjoying” playing shoot ’em up games has all but been lost….
The game is a combination of Dangun Feveron and an academy-based visual novel, and through it, you can learn how to play Dangun Feveron. The main characters are female personifications of the player ships from Dangun Feveron.
source: gematsu.com