I really like this game. The music is great and the puzzle dynamics are simple enough to understand that the "game board" starts to make sense quickly with fast mouse-overs of the different icons.

I was tempted to make a "Relaxing" or "Soothing" games category, but it doesn't make a lot of sense as a category. I think I'll reconsider that later though, since games like this really are nice to be able to just soothe your brain and relax a bit, but still play a somewhat meaningful game. Good stuff.