A Little Short - Unfinished

This is what I have so far.
I have advanced into this with no idea what it would develop into; I simply opened Pages and typed whatever came into my mind.
Note that I just read two Jose Saramago books, so the style may come off as a little familiar . So, can anyone please give me pointers on the style, or on how to continue - your opinions on what this should develop into. By the way, I don't know if age factors into this, but...I'm 13, so cut me some slack. Or maybe not .

Thanks in advance.

The boy looked at the huge row of breakfast cereals, each box decorated with bright colors and promises of an increased supply of vitamins and energy and whatnot, and promises of a chance to catch the premiere of a movie, and promises of a free plastic toy - shameless merchandising, yes, but nonetheless effective. A little voice inside the boy dared to remark that they were all probably made of the same combination of wheat, sugar, and obscure chemicals, but it was quickly shut off as the boy pointed at the one with the boldest, most prominent packaging, and with the most promises of a great taste and lucky draw prizes, once again proving humanity's ability to capture uniqueness among drabness, and how well it complemented greed and the belief of triumph over insurmountable odds. Papa, I want this.

Papa looked around from the canned tuna, saw the box that the little finger prodded, and mechanically tossed it into the supermarket trolley, whether from fear of evoking another tantrum, or simply accepting that the boy had to eat, and if he did, why not make him happy along the way.

A grin spread across the boy's face, happy his wish for breakfast cereal had been fulfilled. The father, too, smiled, a reflection of the boy's delight, and why not, for, as so many parenting books had told him, if his son was happy, so should he.