I'm really happy that someone is enjoyed the map the way I do! : ) And I gladly answer your questions, FellDian:
About the food/heat/energy balance I need to say that it is meant to be hard but not annoying, so a slight decrease is possible, though I need to think about it. Consider that energy regeneration increases with level (according to hero class, the warrior for example is really a bit sleepy one), heat can be easily eliminated if you make some soft-leather clothes (which means you will have less defense, so the choice always is between survival and battle hardiness), and hunger is no problem if you always carry a stack of Meat Stew or learn the locations of berry bushes on map.
In this version of Reborn (2.0) the most "economically important" animals are breeding - that means that when the time comes, the already grown animal has a chance to have offspring (for most animal types it is 20% to have one baby, 20% for two, 20% for three and 40% for none). The baby is spawned next the "mother" and can walk around and gather energy for growing. The "mother", however, becomes old, regardless if she had an offspring, or the bad 40%, and her energy starts to lower. When it becomes 0, the old animal dies and drops nothing ("decay"
. So if you want nothing to be wasted, you should attack only old animals - they are a bit stronger, but drop some more resources. The whole point is that the map is kept different each game - on some places animals will perish "naturally" or be eaten by trolls, but on some other parts of the map in time will be formed whole herds/packs of animals, which can be attacked only by the whole tribe!
Some other animals like the birds, mosquitoes and snakes do only respawn - if you kill one, after a day or two another will be created around the place you killed it.