Very restful and relaxing game, great atmosphere and design both graphically and in the sound. Not a lot a gameplay as such so I was going to give it 3.5 stars. Then I got the ending and it was beautiful. There are games where you work very hard to get a payoff and they don't deliver ... this one delivers, at least, if you're in the mood to appreciate it. And the preceding gameplay successfully gets you in that mood. This is a tricky emotional thing to pull off so I added an extra star on!
Would easily have been a full five-star game if there had been more gameplay to it, though a tricky one to pull off as you would need something challenging but still relaxing. Have you studied the work of the psychologist Mihaly Csikszentmihalyi on the concept of "flow" - how to get the "right" challenge level into an activity? Worth a read for you I think.