This is the playable version of the song "Bad Apple!!", available in the fan-game "Touhou Multi-Boss Rush" (v4.0.22).

The goal is simple: survive until the end of the music with as little damage as possible; some parts are unavoidable, and therefore impossible not to take damage. My record is 33 hits.

By the way, if you don't know the music video on which this script was based, I recommend watching it before watching this video.
It's this one:    • 【東方】Bad Apple!! ＰＶ【影絵】