Cute style! Could be really fun with some goals or a surrounding world, and maybe some different food types and unique body parts. For now I don't know much more to do than place a few creatures and press play. It is really impressive for a gamejam game though.
I think I got an infinite loop by placing 3 heads (far apart) and then adding a body part to each head. Without pressing the new creature button. The whole game/browser tab froze. I even had to disable the browser cache to get the game to load again, I think the savefile got corrupted or something.