It’s a genre. It describes games that are like the fast-paced FPS games of the 90s. Dusk, Amid Evil, Boltgun, Prodeus, Turbo Overkill. All modern examples of the genre. But they’re in the vein of Doom, Quake, Unreal Tournament, Duke Nukem etc.
Like it or not, it’s as accepted as Metroidvania or Soulslike. And the games…