Absolutely great game! I absolutely love the graphics style and day/night cycle's influence to view distance.
Sadly, full screen does not work for me on OS X 10.11.5 (may be because on the Mac there is no "enter" key, just return? Although it should be enter when pressed while fn held down …).
And maybe, you could add some kind of ending (i.e. a message in the chest or so) after one finds the treasure to create a more satisfactory feeling in after the "main quest" is finished?