I think it would be really great if the player’s viewpoint and head location were tracked more and used by the program. This would allow for the 3D body of the player to move somewhat with the player and avoid clipping. Also, and this is a big one, you could interact more with the mistresses. They could tease you with an almost kiss, or french you, or slap you if you get close to their face.
Or even better, make you suck their strap on. If you move your head, the mistress would just keep up with you and not let go of your head.
Currently if you move your head too much you clip objects which can be odd at time especially when you see the innards of their heads. That being said, I wish it was possible to take on the POV perspective of some of those statues in the temple!
Finally one other feature request, In August’s mistress demo the player had the ability to change the body of the mistress to a wide variety of options. This would be a great feature to have for the full game. Some people love very thin girls, or curvy girls. Some love an overpowering amount of muscles, or just an athletic build. Attraction to your partner is a big part of femdom, otherwise it may just feel purely non-consensual… Which also may be a feature for some.