It's a typical Touch interface many try their GUI to be versatile for mobile usage i also got that feeling here.
And i know what you mean the Game mechanics are only their to tell the story but it feels awkward if you pay to see something that isn't realy making progression with your brain but just collect as many money and gems as you can to see the still very limited interactive sex animations
Overall this Game Design concept feels bad really bad it gives your brain so few to chew on it's just building up a addiction to get to the sex scenes and so feels only like total manipulation.
Also that their is a ingame currency also brings you into the direction that this is maybe also a design goal of the future to make it online it absolutely feels like some of these smartphone microtransaction designs.
I personaly hate these Smartphone Games their only reason to exist is microtransactions i hated this development from day 1 and i see what it does to young people i find it absolutely wrong.