This was shockingly good. The art is really nice, and the whole game does a great job of committing to its chosen style. The gameplay seems well executed but I can't really say if it's good or not personally.
If there's one complaint I have, it's that it does feel like the story starts in the middle a bit.
I don't get on well with bullet hells, though, and even easy mode was beyond my limit. I made it through the first level with one continue but didn't even attempt the second.