Thank you, IneptOrange for playing my game and leaving behind such a thoughtful review. I believe the framerate is dropping over time because there are increasingly more NPCs to be rendered, and they all are moving constantly. There is a way to delete body parts in the creature creation mode, but it is buggy: you have to drag the body part, and as you are dragging, you press the delete key. I will certainly be adding more and more features to my creation, and fixing what is broken.