This game has a lot of potential, and I look forward to seeing what will happen next. In the future, I hope there will be a relationship system added in, along with quests to fulfill for how you train a slave to be straight, gay, or bi.
But most of all, I want to possibly see you breed with your slaves. You can try to breed out your most talented and beautiful slaves to create the perfect future slave to either sell or keep for yourself, OR you could decide to have your own child bred with a slave become your heir, which you'll train to be your successor and play on after you due to being more talented and skilled at slave training than you were because as the second generation, they'll pick up the skills for training faster than the original character did and will therefore be better.
It would also be fun if you could try taking slaves from nobility or even invading countries/pagan royalty. That could open up more doors for you in terms of being able to mingle with upper classes beyond simple village slaves and you therefore can have a chance at improving your status.