I've been a fan of the characters' dynamics and the direction you took since I happened upon your 'spin-off' as you call it, I was actually disappointed when I couldn't find the main game after completing Ukuzala. As for this game, the puzzles for Coffee Story just got us early players distracted by their complexity and as a result it just so happened none of us even considered to type up an actual review. I also don't think I've really seen under any game I've tried on this platform where someone posted a real concise review before. I usually only see those on games which have already launched on Steam.
It's my opinion that for a recently posted game, it's already a very well thought out and written product. Yes it's lacking in actual story quests in its current state, but no one expects a homerun with a game that's still under development. There's already tons of lore that collectively create a story and for the player to discover and ponder on, but I'm also aware that each of the characters will have their story lines expanded on in due time.
My hopes is that in future versions you might consider incorporating the option to, through a special sequence of actions, access and spend time in the other characters' dreams. Not just during a quest like with Yuri, but I really hoped to have a tea party with Alice and friends after seeing that in the sleepover sequence. However, as bhcp2 and VocalRhapsody have already vocalized, I believe what is currently needed is more story questlines.
Sorry I cannot offer you a more thorough review, it's just not something I think about when I'm playing for the simple enjoyment of it.