Pretty well
In a review about flower it's easy to go off on some pretentious tangent about how elegantly it evokes a sensation of happiness and relaxation in your soul with its soothing, mesmerizing presentation and the simple elegance of its unique design.
It's easy because it's actually not that far from the truth. Flower may not possess the same qualities common in other games, and that's what makes it so appealing. And it's really hard to describe these qualities in a way that doesn't make you sound like a total hippie.
Flower features tactile controls which after some tuning in feel like second nature. The presentation truly is wonderful, gracefully throwing pretty images and tunes into your face with great abundance. And there's more to it than meets the eye. There's a surprisingly motivating and engaging narrative involved, despite of its incredibly simple design. Simply engaging. I guess that sums up flower in its entirety pretty well.