I'm curious to see how you will add mobs and random event in your game in a teaser soon ^^
A hint. Remember a game called Spore...? Remember its Bacteria Stage? Take that and expand. I mean, really, go wild. Create a real, living ecosystem. Where big creatures eats the small, when predators hunt in packs, where dead carcass is being "purged" by small swarm of creatures.
I want the player to feel like he had been dropped into small alien jungle. Full of beauty... a horrors.