NGL the internet needs more lewd sandbox-type games like this. Too many devs keep trying to make lewd "game" games with, like, plots and complex gameplay and drama and plot-twists and such, but I've always preferred lewd sandbox type games.
Unlockables and progress are fine since that gives the player more things to work towards instead of "completing" the game in 3 minutes, but IMO lewd games with more focus on letting the player just do whatever are more fun.