For a one-man project AND custom engine, this is extremely well made.
The only negatives I would say would be some faces (too manly, usually big/wide noses) and robotic animations. Don't know what tool you are using to make animations, but if it's Blender, the use of curves for animations gives it more natual flow... and makes it easier to animate.
On to other things - your futa isn't really a futa. There is no vagina on the model and I have yet to find any recieving animation that isn't taking it in the butt. Big, BIG negative from me.
The pills - there choice shouldn't even be there. Give the player both, because blue is so much more useful it isn't even funny. Oh, more use for it among your servants.
Futa minion? Why the hell not. Certinaly better on the eyes than a decomposing corpse.
Also, I hope the advice on your patreon problem proves useful. F** them and MasterCard.