Oh, I may have failed to remove all of the save features included in the default renpy set up. That was my intent since each play through is only intended to take a few minutes at most. The "what animal are you?" is absolutely something I found while implementing the system. I ended up with 42 animals just to make that part of it interesting (an expansion of that game would absolutely have more animals but also have some sort of counter for which animals you've managed to end up as).
You are absolutely right on the calculation part. That's probably the thing I was least happy with since you don't know how much power a choice will cost before you make it. I went back and forth about adding that and eventually decided against it since I didn't want to explicitly hint at the "right" choice.
Well... since you figured out they exist either by reading my dev blog or looking at the source: "Sharktillary" and "Evil Clown" give you secret options. :)