Imagine a creature so big, so uncontainable and uncontrollable that it grew so large as to leave the planet it once was on in order to find more food/resources to sustain its hunger, floating through space from planet to planet devouring everything that bumped into it.
I think a planet designed to be one whole creature would look very interesting and would have some really cool elements to it, some dangers/problems you'd have to overcome could be:
1. Giant arms/tentacles on the surface of the planet that try to grab you when you get close.
2. Impenetrable skin which couldn't be destroyed/mined through.
3. A huge gaping mouth at one part of the planet which you'd need to go into In order to explore the inside if the beast.
4. Giant evolved bacteria inside the planet which are basicaly working to digest food for the planet and try to destroy you.
5. A brain/heart at the center of the planet which would be the only way to kill the beast.
An idea like this is probably too big a project at the moment for the people working to create nimbatus, but if they ever fully completed the game and had time to add more, or wanted to release DLC, then I think the idea would be more plausible.
I'm not sure how the missions would work, maybe there could be a rescue mission, or just a mission to kill the plant from the inside, or even a mission to collect tissue samples, I honestly don't know.
