Some screenshots of various iterations on Yuugen
The First Iteration
This iteration featured the barebones camera movement, and the beginnings of an editor script which allowed us to place prefabs on the planet easily via normals.

The Second
At this point we were working towards making the planet more lifelike, and really getting a handle on the scale of things. In the end we wanted to go with a "This planet is way too large for what's on it" feeling.
Also pictured: Start of work on the UI.

The Third
The third iteration saw more visuals, including refactored lighting and a sun and moon. Past that we also added a nice telescope that does stuff.

The Fourth
The fourth and final iteration included adding various effects/particles to the scene(such as the space dust(... don't ask how that got there... we don't know either.), and various prop additions).
Past that this iteration also saw the UI in full, including combining elements.
Bonus - UI:
