Great musing and sfx, and a relaxing color palette.
In my opinion, the kayak was a little too large for the screen in this resolution and the turning camera messes with my eyes a little. But these were not true shortcomings for me personally, because they created to a disorientation very similar to sailing on open sea; they just improved my immersion. :-)
I would have appreciated it if there was some practice or tutorial area at the beginning to get used to the controls.