Thoughts as video plays:
-Wow Sakuya looks a tiiiiny bit BoSM ReimuB-esque
-Really melancholic title theme XwX;
-The SSP selection only shows scarlet, vermillion, royal yellow, jade, turquoise, aqua, and violet, meaning that rainbow, black and white are apparently unlockable
STAGE 1:-WOW the background and stage theme are cool as hell
-For some reason it specified 1-1, 1-2, 1-3, etc, so chapters are still significant somehow?
-Apparently the color effects are less like bombs depending on which color is chosen? Violet is seemingly more passive than anything, though there is a big focus radius for something
-Wow Ranran "drawing" in her nonspells is fucking adorable also her theme is jangly
-Also wow a gimmick first spellcard? Atleast it isn't as bad as Yuyuko's was in RSS
-B R U S H S P I N
-Saruin Slash is a cool spellcard, almost Sekibanki-esque given the brush familiars
STAGE 2:-Oh snap Myouren Temple, also that theme is sad sounding which I like, since I previously said HSoB has a much more sombering aesthetic than most Touhou games
-These fairy and spirit patterns looks REALLY WNSP-ish, especially those wheel fairies
-Oooh cool needle bullets
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ALSO WOW NEW FAIRY SPRITES THEY LOOK ADORABLEEEE-Scratch that last part? Shirobakama Chii apparently created the miniselves for the stage. Her name makes me think she is a
chimimoryu-Wow their theme, AMV much?
-First spell is almost like Rakuki's first spell from SSS
-Simple Youmu V arrows for the next nonspell
-Holy shit their next two spells are gimmicky explosive clone spells, also the gear spell is cute
STAGE 3:-Oooh mystical sounding goodness
-It took me a little while to notice that the playthrough showed off different Spacetime Spirit Strikes for each stage, and apparently they activate like MoF bombs/releases
-Okay this boss and their bird familiars look REALLY like Kiyohime
-The boss, Aosagi Hikariko, is apparently quiet like Sagume (they do the "Aah, a human?" "......" thing and everything) and also has a phone? Though it looks more like she's just too busy looking at her phone to notice Reimu lol also I LOVE HER COLOR SCHEME YESSS
-Also BIRB
-what the hell, is she actually texting ("SNS") her responses? Also multiple speech bubbles?? ?? ?? ?? ?
-Her theme intro sounds silly, and veery creepy/Ruri-ish
-WOAH I love the first spell
-HEARTS AND WIFI, MY GOD. (Mary-san?)
-Ooh spinny bird third nonspell looks like a good difficulty spike, also lol Reimu players will have a hard time dealing with Hikariko's nonspells
-DAMN i am scared for how hard that third spell will get on Lunatic
-Okay now we're just ripping off Utsuho
-OHHH SHIT ACTUAL SPACETIME SPIRIT STRIKE (though i dont know how it works lol)
In conclusion, I really like how varied HSoB is going to be, simple as that. Good music, good characters, phenomenal style and aesthetic, everything,