A beautiful, charming, humbling, and difficult experience that's a good fit for shoot 'em up fans, but perhaps strange and unwelcoming to newcomers.
Grab it while you can.
Yeah, that is going to be an issue with all Cave-developed games. Now that they just license their titles to different companies, we will start seeing their games getting delisted and probably re-listed at a later date by a different publisher.
A bullet hell from the past that may not have caught up to the present.
Rocket Chainsaw: The overall package for Mushihimesama on Switch is excellent. Four modes, each with tonnes of replayability for anyone looking for a bullet hell fix.