Radiant Silvergun will be on Steam tomorrow. If you haven't had a chance to try out this classic shmup then you won't really have an excuse anymore! It broke tons of conventions in the genre and still holds up really well due to the 3D graphics design complimenting the capabilities at the time. It's also far more serious in tone and story than most shmups of the time. In my opinion, the only weakness these days is the dated anime style the characters were done with. They really stand out in a bad way to the tone of the game, though the voice acting is okay.
https://store.steampowered.com/app/2...ant_Silvergun/