I've played this game back in 2004-2007 on Windows XP. I had it in a CD-ROM that I think is not in my possession anymore.
The game had a very distinct "technological" art style and HUD. It wasn't pixel art, and it wasn't cartoonized either. Something akin to the style of Ginga Force, but more low poly. It was probably made to run on very small resolutions, because I remember that when I put it on fullscreen, the start menu got very pixelated. The start menu had around 8 options and the font was red. While trying to look for it, I've found that Genetos has a certain part that looks like the one I'm looking for. It's at 3:22 (in case the automatic timestamp doesn't work) on the video https://www.youtube.com/watch?v=P34tYD0MO14&t=202s.
The game had two standard ships, one red and one blue. There was a difference in their pattern of attack, but both shot blue laser bullets. There was a 3rd ship, which you could unlock by looping the character menu a lot of times until it appeared. That ship was dark green / black, and it shot a huge green laserbeam. You moved the ship with the arrow keys and used Z to shoot and select stuff in the menus.
I can't remember any of the bosses, but the game was short, I estimate around 5 to 8 levels, and it was not a particularly hard game (given that I was able to beat it as a child). There was a storyline, although I'm not sure if it was in english or japanese. It happened in the form of dialogues between the ship's driver and someone probably on a command center. I also think that the only visual aid for the characters in the game were their heads, they didn't have full body illustrations, and the red pilot was a red haired anime girl (possibly implying that the blue pilot was a blue haired anime girl as well), but take that last part with a grain of salt, as it is somewhat of a blurry memory compared to the other parts I've described.
The ones already suggested to me, which I've ruled out, are: Raiden series, Raycrisis, Raystorm, Blue Wish Resurrection.
Thanks in advance!
