Len'en Project

The Len'en Project (連縁Project / 鏈縁Project lit. Connecting Chain) is a Japanese doujin game series that specialises in shoot 'em ups by Trick Nostalgie, whose sole member is game developer JynX. The series is notable for taking heavy inspiration from the Touhou Project. As such, it is a series of 2D (with 3D background) vertically-scrolling danmaku shooting games. Although it takes inspiration from Touhou, the games are technically not fangames towards Touhou. It is set in a separate world which features an entirely new cast of characters, therefore having its own canonicity and plot.

Source: Len'en Shout Wiki

I like Len'en Project series. It has nice lore and musics.