I had a hard time figuring out what changes were effecting what plants and animals. I can see how if I created this, knowing the ins and outs, it could be clear what impact the changes make. But as a fresh set of eyes it was hard to figure out.
This might not be so much a problem with the engine, but with how information is portrayed, I understand that this is just a showcase of a mechanic, but it might need some simple animations of animals eating and dieing to get across the impact of changes to the environment.
I don't mean to discourage you tho. The concept is cool, and I can see this being used in some kind of management or God game.
Keep up the good work! :)