haven't played it (saw it on YouTube) it's a cool idea. One thing I'd like to see is the creatures have a chance to evolve their structure as well. Like mutate to add or remove joints bones or muscles across generations. Having an immutable body structure doesn't make for interesting evolution over the countless generations
Edit: sorry I kinda misspoke. It's for sure interesting and evolving neural nets are awesome... But it's only half half of the evolutionary process