Let's get one thing perfectly clear, and don't take this the wrong way but: Flower is not a game -- it's a relaxation tool.
Underneath the experience, however, is a tale illustrating the contrast between the stark, gray, concrete heavy look of the urban world, and the tranquil, natural beauty of nature. There's some environmentalist undertones to it, but they aren't terribly strong, nor are they forced down your throat. Rather, it's up to you to decide what you take away from it.
The tale is told over the course of five levels, each comprised of three sections that, at the most, take a few minutes to complete, so you could probably finish Flower in about, oh, an hour maybe? And while its disappointing that it's over so soon, the experience makes up for it.
The main theme of Flower is rejuvenation. As the wind, your job is to bloom flowers spread throughout the vast levels by flying toward them. Upon contact, the flower blooms, and a petal is scooped up by the wind, eventually creating a beautiful string of colors in your wake.
As you bloom flowers, the environment begins to change. The effects vary from level to level, but they're all equally breathtaking. From changing gray, lifeless fields and rock formations into a rainbow of colors, to bathing dark fields in the dead of night in a brilliant blue light, Flower's visual prowess continues to dazzle the player with its beauty.
It's through those elements that it manages to lull the player into a deep state of relaxation. Simply drifting through the grassy fields, exploring all the various nooks and crannies searching for the three hidden flowers in each level is engaging, yet very calming. Heck, even just leaving the game sitting there while you sit back on the couch watching the grass gently sway in the wind, listing to the soothing sounds of the piano-based melodies is entertaining. It's really something special.
While the audiovisual element is the game's strongest point, the control deserves special mention as well. Utilizing the sixaxis motion control, you're able to guide the wind by tilting the controller in the direction you wish to move. The turn speed can be a tad slow, and making slight changes in direction is next to impossible, but the control itself works beautifully and feels natural. It is easily the best usage of the sixaxis thus far.
The replayability factor is low here, with only a hand-full of trophies to collect, and hidden flowers to find, both of which are easily achieved during your first run-through. So unless you often find yourself stressed, you probably won't be revisiting Flower often. But it make up for that by giving you a memorable, unique experience that will stay with you long after you've reached its conclusion.