you really need to work on your imagination a bit
this game probably is better than most of those "similar games" you are mentioning as a role-model for sex scenes
anal is a kink, as well as prego, ntr, etc etc are as well - those arent by any means "required" for game/scenes to be good, despite having their "hardcore" fans which usually bump into any and every thread asking about their kinks and wondering wth dev doesnt improve his game by adding it...
once again, imo, this game has some of the best sex scenes ever (talking about porn games), despite it doesnt have anything of those "hard" kinks.
the dev will probably add some of those, partly probably to please the audience requesting it, and partly due to story he has planned (there are already some markers/variables for it).
im hoping when that happens it will fit characters/scenes, and most importantly it will be optional.