That is not a bad idea to start in the macroscopic stage.
Although I’m not directly involved in game development, I know such a division can make some order.
But the problem I saw here is not related to you, these are one of the things I remember about the development stage of this stage:
They plan to center the player as the basis for all the creatures that come after him.
At first, it was based on what the player created, but later it seemed that Auto-Evo would encounter a number of issues that would require developers to think deeper.
But let’s leave that aside, the idea of organizing the types by categories is to be something that will help the center a few things, but I want to share something that might help you further develop your idea since some of it has been talked about in the past (by me):
But in short: there are 3 layers from which all things in the body develop. Maybe you can use that as a basis to develop this idea.
As for Defense against decay, this is something that happens regardless as part of the natural way for cells to maintain themselves from breaking down, so I think it’s less relevant and if it’s related to the skin or dermis, I think it’s worth considering as the ‘outer layer’.
As for reproduction, this is probably the first thing in specializing in the process of creating the first multicellular, and there are many ways to reproduce, and I think it’s a great idea to separate it from the rest.
Besides, it’s a great idea, but I have no idea what’s going on there.