Cave is one of the most famous campany  making shmups. 
The "怒首領蜂" (dodonpachi) series are the classical type of
fire cirtainbullet STG that is called "弾幕 (danmaku) STG".
There many STG titles Cave made. The newest one is "怒首領蜂最大往生".
Though there are many Cave shmups, now only 3 games I have. 
I wanna buy another shmups as soon as possible.

・怒首領蜂　大復活　ver1.5
・怒首領蜂　最大往生
・怒首領蜂　大往生
・虫姫さま
​・虫姫さまふたり
・ケツイ
・デススマイルズ
・むちむちポーク！