Unity is a great engine for free-roaming and other games who want to include complicated features.
But for a multiple branch visual novel... it's a fucking pain in the ass. Not being able to rollback, not being able to skip text (I press S but it never works), saves take like forever to load...
It's frustrating.
Anyway, right now I think I'm on an Ann-only path and just met my "roommate." Very nice evolution with our newly found sweetheart. Perhaps a bit too rushed or artificial at some points but, well, this is a light-hearted porn game. Nothing against that.
Besides, Alex's face is perhaps one of the top 3 most beautiful I've seen in these games. She needs a little more ass though in my opinion. Art is great in general terms, and the only animation I found so far with Ann was also impressive.