Try to sutain some life and see what you can do to make an evolution. Press the button to spawn a standard cell. Rarely, newborn cells will mutate, changing their behaviour and looks. You can also drag the cells around if they're too cuddly for your taste, but be careful as some cells might require to be with their own species to create offspring. If you want to kill some cells there's a knive on the right side of the button, just grab it by it's handle
Thanks to myself for such a brilliant game Idea I'm not shamelessly copying since the dawn of my existence.