This game does a MoF stage 4 style difficulty jump in stage 3. :V Feels like StB or ISC with the Groundhog Day looping. The new characters are strong on the lunar theme.
Also, Touhou music still doesn't disappoint. The soundtrack's got this majestic, royal focus to it, with organic scifi undertones. Lots of catchy melodies and playfulness giving me definite PC-98 vibes. Instrumentation is stepped up one more notch from DDC and ISC, there's lots of delightful subtleties and colorful textures.
And another music thing which pleases me personally - the mixing has improved! DDC had strange jumps and sudden stops in dynamics, but this time the palette is more even, so that instruments feel like they're playing together instead of competing for attention.
The early stage themes feel like extra stage themes already. Of course that complements the high difficulty. I almost won't dare to see how bombastic this whole experience becomes in the late game.