Would be nice with an uninstaller or something because your evolutions, if ran a fair bit, will take a considerable amount of disk space and those evolutions are saved in the appdata folder, but the user has no idea of this.

I'm from Mexico and I would love it if you could translate the game into Spanish, it would make it much easier to understand the game. It would also be nice to be able to change the simulation speed once the simulation has started, and not have to start from scratch every time I want longer simulations.
Hey ! Based on my observations hidden layers of the neuronal networks use a sigmoid function of activation. In motor application like this simulation of creatures, this function quickly converge towards "lazy movements" which gives contractile creatures or those that hop or swing. It's quite efficient when we want to jump or fly but get complicated when we want to run or climb like a bipede/quadrupede. Dunno if it's complicated to implement but adding functions like ReLu or Tanh can be a great upgrade for the game ! I can't realize you've done this game 7 years ago u did such a great job !