Looks great, if someone told me that was a screen shot from No Mans Sky, I'd believe it at first glance. Which is really impressive for a game jam with a week of dev time.
Heres the link from one of the devs about the shadows. http://forum.unity3d.com/threads/183031-Mobile-game-deployment-with-Unity-is-now-free!?p=1250768&viewfull=1#post1250768
I am not for or against Macs. In the end of the day it's just a tool. And I only own them because of iOS dev work and the only app I have installed is Unity.
A interview with a valve dev where a bunch of users come up with the questions? Not sure if something like that would be within your reach, but it would be could provide lots of useful information!
I started seeing your textures Dev and checked out Torchlight...I also started doing some practice painting of my own...thx for the inspiration. Nice work.
theres some pretty dec "how it was made" threads on conceptart that show some good techniques for coloring sculptures that could be applied to painting 2d textures. check em out..