Let's get this out of the way.

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

>>714175462
Psikyo wants you to hard memo instead of reading and reacting. It's a bit of a double-edged sword though, because once you know how to dodge these fast spreads you will just do it easily every time without thinking about it.
Hitboxes aren't the entire sprite usually but bigger than something like danmaku games.