Untrue. Wikipedia says:
>By 20 November, Gaza health officials said that 113 Palestinians had been killed since the operation began, of which: 53 were civilians, 49 militants and 1 a policeman
Note that is an estimate from a Palestinian source.
Carpet-bombing, or anything close to it, would have resulted in a far higher number of Palestinian deaths. Any loss of innocent life is tragic but these numbers show a commitment to minimizing civilian casualties on the part of the IDF. Unlike Hamas which intentionally targets civilians with their rocket strikes.