Took me a moment to grasp what is going on but then I greatly enjoyed the subtle complexity of the game. The minimalistic text-only UI forced me to imagine what is going on. It took me a bit of experimenting to figure out how to balance my ecosystem but it felt like a satisfying learning curve. Towards the end the game things became a little repetitive and convoluted with all the species and attributes to keep track of, therefore would have liked a way to get an earlier ending. Overall, very nice simulation - great job!