This game is a tutorial for shmup beginners.
For many players, the danmaku, or "bullet hell" genre can appear daunting and impossible.
However, once you know the tricks, you'll see that many danmaku patterns are nowhere near as hard as they seem.
This game teaches you all the fundamentals of danmaku you need, from hitboxes to dodging techniques.
Grab this tutorial, and get started on your road to the unique joys of danmaku!

Note: This game is a remaster of the eponymous free game from 2016.