Surprisingly complex with a lovely and unique puzzle mechanic. I've sometimes been stuck for ages, and other times, just breezed by. The story is given to you in fragments but is packed with feeling and character development. The world and plot is not spelled out for you, but you retrieve memories of what is going on as you are playing. Beautiful, soothing, and sad. If you play this, you'll most likely come out of it having felt some sort of emotion you can relate to, and that's a strong achievement for any game in my opinion.