Guess I will

PACK POST!
Original(kept for legacy reasons): archive.org/details/shmupg-pack
Leinyan certified version(Enhanced, recommended): archive.org/details/mature-dot-dodging-games-gaiden-v-1.0.7z
A mame fork with more accuracy for CV1000(https://wiki.arcadeotaku.com/w/CAVE_CV1000) games: https://github.com/CoffeePope/mame-sh34

>2hu where?
nyaa.si/view/1743411
And more doujin shmups at vector.co.jp/vpack/filearea/winnt/game/shoot
https://freegame-mugen.jp/shooting/
https://www.freem.ne.jp/win/category/2

>B-But piracy is illegal!
Faggot shmups.wiki/library/Free_to_Play

Temporarily pasted anon's suggestions from some threads ago here:
pastebin.com/ZzHxJ38H