Hi Yummy! I'm really glad you are enjoying this alpha concept of the game
Regarding the style, each girlfriend/story will be illustrated by a different human artist, and the same goes for the each story is being crafted by a different scriptwriter, currently, we have two storylines written that are already in the illustration phase!
About Shybox, absolutely, Shybox left a mark on the NTR timeline, the way people appreciate the genre completely changed before and after their work. NTR Phone is the favorite game in the genre for almost everyone here at the studio
And to answer your question, yes, there will be a happy ending! We call it the "Love Route", but I'll warn you in advance, it's going to be pretty hard to avoid getting cheated across so many chapters 😅