The themes are really good! I love Sakuya-A, but most runs on YT are all Reimu-B :c
Anyway, rankings on the DDC themes amongst the other themes from the other games (just my opinion, don't judge :3)
Descending Order:
Stage 1 Theme:
The Dark Blowhole
At the End of Spring
Night Sakura of Dead Spirits
Mist Lake
Paradise ~ Deep Mountain
A God that Loves People ~ Romantic Fall
A Soul as Red as a Ground Cherry
Illusionary Night ~ Ghostly Eyes
Pretty good theme overall, I liked that it was very upbeat and happy (but then again, aren't all Stage 1 themes?) and then it reminded me of Bad Apple at first. I liked it pretty much, but still not as good as themes like The Dark Blowhole or At the End of Spring.
Stage 1 Boss Theme:
Ghost Lead
Crystallized Silver
Because Princess Inada is Scolding Me
A Tiny, Tiny, Clever Commander
Mermaid from the Uncharted Land
Stirring an Autumn Moon ~ Mooned Insect
The Sealed Away Youkai ~ Lost Place
Apparitions Stalk the Night
Messy introduction, but then it really gets into it when the nice melody kicks in. It got stuck in my head after listening to it for a while, so good theme, not the best, but still nice. Also, the guitars. Needs more metal arranges.
Will edit the rest in later, that's all for now!