Bottle is a short game that you play as a man of solitude. In the game as you walk through the path, you see the visions of a woman and read the notes she leaves to you. Sometimes, you need to do some things and figure out how to reach her. Additionally, you can do a few exploration in the game if you prefer. There are some things to be found away from the path.
As you progress, you hear some nice piano tunes as well as the sound of the soft wind, together with the sound of shrubs moving and some animals. Those are things that make the game more atmospheric.
The game is sometimes mystical, sometimes funny, sometimes scary, but mostly relaxing.
After you complete the game, another mode called "Noir" is unlocked and you'll be generally playing the same game, but with another atmospheric black & white filter - it's night time. In Noir mode, you'll find some surprising differences, as well.
Note: The orbs you collect in the game give you a temporary speed boost.