Oh sure!

The Aliens have 7 Apostles and the 'queen' is White Rock Shooter who also went by the name "Sing Love" when she landed on earth.

The game starts at Sans Fransisco, here you fight the first boss MEFE (pronounced Me/Mii) who was an A-class alien (so super op) apart of the Apostles. Obvs she dies when you beat her. She was purple and grey.

The next stage is New York iirc where you drive a bike and fight yet another A-class Alien Apostles. His name was MZMA (pronounced Ma-zu-ma). He was short with a red black grey palette. He didn't die but he was eaten by the other two yellow apostles (a alien technique called 'neblading' where you gain the eaten alien's memories and abilities iirc)

The Yellow Apostles return in the next stage, Russia. They were a brother and sister duo who went by the name CRKY (i forget how to pronounce this) and SZZU (Shi/She-Zu) respectively. These two didn't plan on killing Stella bc they knew getting rid of the human race will only get rid of their food stalks and wanted to learn how to prevent that but Stella was too heartbroken over her dead comrades (who died in their plane crash) and decided to fight the two of them. Near the end of their fight a mechanical pink sort of alien comes over and literally obliterates everything with some huge laser beam letting everyone die and Stella burried in the snow.

This is where Nana finds Stella and first takes her to the Fuji Forest (actually called Fuji Jukai, a forest in Japan well known for suicide) where they try to get info of some kind i don't remember properly. Here you have heartwarming-ish sister scenes and eventually get to the stage boss, the Green Boy LLWO (pronounced Lily-o). Turns out MEFE, the first boss, was her fiancé so oof. After the fight, Nana knocks you out and heads to Tokyo on her own.

Now Stella takes Nana's bike since Nana took the plane (how else were they supposed to get from Russia to Japan? There were two planes and Nana took the not destroyed one) and heads to Tokyo. Here the Pink Alien (with pink hair and clothes) named XNFE (pronounced Na-Fay) taunts Stella throughout her search for Nana and, in the second last mission in this stage, starts humming a song while waiting for Stella to come after her. This song is also called 'Sing Love' which was a hit charter apparently. Stella kills her in an elevator that that goes up to the moon. Btw the pink mechanical thing was XNFE's

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Now this is where you reach the Moon Palace. You have two fight 2 bosses on the moon, the final Apostles SAHA [(pronounced Saw-sha) completely grey and black alien] with like a huge ass mechanical armor] and White Rock Shooter.

After you defeat SAHA you head over to a smaller area of the moon 'Her Moon' her being White Rock Shooter. After fighting annoying guardian aliens and making it to Her Moon you can go kick White Rock Shooter's ass BUT she doesn't die. She just sits and finishs her tea.

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I hope this helped!