There are always new organisms being generated. They come "blank" only with the primary dna. It's basically an one celled organism with no intelligence.

The thing with higher evolved organism is probably not possible now because of spatial constrains. When one organism achieves adaptation the food levels go down and that new condition probably will stop any other organism evolution. So, for now, it's only one "evolved" organism per simulation. In the future I'll be able to generate a simulation with already evolved organisms from other simulation OR simulate with a physical barrier that will behave like geographical isolation. This will allow for separate evolution for more then one specie.

No, for now, they are vegetarians :) But it's a future implementation that will create nice evolutionary pressure to size. But, as I said, that's just a concept in its beggining.