I had the exact idea a year or so ago and made a quick prototype. I didn't have enough skill back then to finish my idea, and it has a few glitches, but maybe you can do more with it then me!
(It uses marching squares to build the planets)
**Click on the planets to take chunks out of them**
[Dropbox][1]
[1]: https://dl.dropboxusercontent.com/u/54313608/PlanetGame.unitypackage
Hope it helps!!
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