Like @ddrosler said, I didn't really understand what was going on until the third level or so. I just pushed things until it worked. It would have been nice to have a simple walk through level at first with associated text for me to understand the whole sun/moon angle thing. I got stuck on level 4 but after others helping me put me in the right mind set I was able to do 5 and 6. Really liked the concept! Music would have been a touch nicer. Great game, thanks!