The whole vibe about this game is so peaceful. I really like that there is no other background music other than the natural sound of waves and the wind.
My only critique is that now the only way to tell how high the stone is above the water is by the timer. It would be nice if the stone can cast a shadow on the water, and player can judge can high the stone is base on the size the shadow. I saw that each time I bounced, the shadow appeared shortly, but it doesn't have any impact on the game play. So I think it would be nice if the shadow can be used as an indicator of height.
Overall I really enjoy this relaxing game! Nice work!