Flower does pack a hefty amount of actual gameplay behind all of its nuanced bliss. The later three levels vary the formula a bit without abusing the inherent mechanics. Furthermore, for those determined enough to find every last un-blossomed flower, three petals can be "earned" for each potted plant in your window. Trophies also make an appearance, the most amusing of which correspond perfectly to Flower's ambiance.
Again, these tasks aren't things you have to do to breathe in Flower's lush atmosphere, they just appear to be a seamless concession thatgamecompany was willing to make in the wake of flOw's alleged lack of true gameplay. Flower could stand without it, but it's good to know the options are there.