Tweaks 0 2

Adjusted the balance a bit (robot fish takes 2 seconds to digest now instead of 5) and added a garbage count.

Future design plans go like this:

After keeping the fish at least one mutation away from "fish kong" for a long enough period, it will swim off, add itself to a rescue tally (points proportional to how little de-mutation it needed), and another fish, or several, will swim into view. New kinds of fish, new looks, new paths, different speeds. Keep them safe for long enough, and the cycle will keep going.

Right now I don't have the art resources or the time to make any of that look remotely decent, but the goal for this was basically to make a one level concept demo.