A small piece of "what can be done" with Unity for Android devices. My son loves Solar System Maker and planets in general, so thought I'd give it a go.
On the planet maker page the Off buttons (next to Primary and secondary texture buttons) are also reversing the cycle (there are 52 different 2K textures, therefore the big size).
The future ideas are: moons, getting the created planets into the solar system, maybe some minigame in the solar system.
NOTE: This is for ANDROID only! and is not part of the original Space Travellers Guild.