Yea, there's a lot that will go into it. I've been contemplating trying to make something similar to spore, but using a formula to generate genes and traits to keep the game as open ended as possible, rather than being limited to a few hundred creatures. Also with maybe kind of a sims feel to it, but sciency, using protiens to cure diseases, stuff along those lines. I guess it's not really an engine, but it's a game haha.
Well cool. Velkommen til PF.