This is very personal of course, but for me, when I play adult games, I get the greatest satisfaction and sense of progress from grabbing screenshots of the game. I understand that there is more often than not a gallery function, but I find progress also in costume changes, unique events, and poses that may not be part of the gallery.
I enjoy great art and have high standards so the act of making screenshots is also satisfying as it grows my own library and an unobstructed view of the art is a must, otherwise it feels like looking at great art through sunglasses or a filter on top.
I've noticed small differences in how RPGM games handle UI/Interface. For instance:
- Warlock and Boobs, sometimes (not all the time, unfortunately), a scene will pause with only (...) appearing on screen. This pause gives the player all the time in the world to enjoy the art/action and take a screenshot when ready
- Manila Shaw: Blackmail's Obsession, there is always a solid 1-second pause between when the UI disappears and the moving from one shot/scene to another. It's not much but it's enough.
I'm no programmer and I have no idea about the inner workings of the engine, I'm simply pointing those out so that perhaps it can be of consideration to you.
Your art style is quite exquisite, by the way.