I love this game!
maybe you could could make the way to put multiple creatures in one ecosystem easier, and make them compete, like the race mode and the only ecosystem but combined!
another thing would be adding more maps and ready ecosystems!
as well as making the current non walled maps bigger/making it so there are more obstacles and decorations.
a fatal flaw i noticed is that a carnivore eating its offspring actually has some net gain, (i think), it should be more of a loss than a gain, also there should be a way of differentiating your species from others in the neuron system
other than that, i really enjoyed playing this game :)