The bacteria like creature will live its life from a mere blob to gain legs/arms/ears etc.
The user will have to control the temperature of its environment to see different outcomes. We would like to use a light sensor for this application, but more R&D is required, so for now we will say temperature is controlled by user input via the keyboard.
The idea is that the user will keep the creature at a fair temperature, not too cold and not too hot. Just right. Otherwise it will die and won't be able to spawn off any offspring.