They Dance With Asteroids by TurnWolf 2017-05-03T13:43:07Z
I really like the concept and the design.
However, i find the gameplay quite hard and tedious. I did not manage to bring the planet to the goldilocks zone. I had problems especially with getting water, because both H and O reduce core, and it seemed that every element, that increases core, also decreases water. I also agree with Sleepy about the asteroids.
Those problems can be easily fixed by some number tweaking and i love the gameplay idea.