Correct me fellow players (or dev) if I'm wrong but I believe it has been deemed a finished product by the dev. The last few updates were just the dev fixing some bugs.
Personally I would have liked to have seen some degree of animation like when an event happens or browsing *ahem* workers. They have an image to go with them. Slaves maybe they have some sort of collar, nymphos have hearts for pupils, cyborgs you can kinda see a more mechanical body, bots have seems at their joints.