I think the customers grow tired way too fast. I think customers that have been served should stay put for way longer. It's cool to have a video game that's porn, but that means both the gameplay should be fun (and not unforgiving) and the porn should be entertaining. The moment the porn is mid, or the gameplay gets in the way of the porn, it's a fail (imo). This one is in need of making the gameplay more enjoyable and less "speedrunny-ish"
I think mixing them is fine and works. I do think having a little more time both to see the portrait and to actually play the game would help, but Im not a dev. I just noticed that I was so focused on playing in order to keep up that I was having trouble appreciating the sheer amount of work put into the lewd even in this early demo. I had to actually be willing to lose to take time to notice things, which is not a great thing since no one wants to have to lose.