I absolutely loved it. Strangely enough, my girlfriend didn't. She said it was boring and pointless...aaah, simple minded little thing, but I love her.
I guess you've got to have a certain gaming background, so you can see what flower trully is : something new in videogames, something few have dared to make, and when you've played videogames since the late 80's you can fully grasp why is this such a big deal, why is flower so special.
A true breath of fresh air, loved every second of it (plus the trophies are fun).