Really nice game!.. Suggestion : allow us to manually set the input lag instead of forcing the click when you hear thing. It's easier to fine tune this way.
Also, IMO, the fact that the instruction are in small at the bottom left kill the immersion for me. I always have to lose focus on the girls to check what I'm supposed to do and since the "grip" changes very often, that's a big part of the game. Also, why do we have to press tab to access other items? Why not just bind them to other button. I don't have time to cycle item views by pressing tab while stroking. Just make the item from 0 to 9 and/or allow us to rebind them and keeping them all at view at once?
Also, I have a problem. When I get the "shop screen", I cant select the 2 lower choices (succub shield and the air drop thing). The button is hidden under the UI. Can I scale the UI down or something? I'm playing in 2560x1440 fullscreen.
Other than that, it's a really fun game!