Gaza is held by a terrorist group, defined as such by US and other western countries. It also keeps attacking Israel with missiles. Nevertheless Israel exports medicine, food and concrete on a daily basis to help the civilians in Gaza. Do you think Israel should help them more in any way? What is a sufficient aid for an area which you're in war state with?
In addition, for importing/exporting commodities, Gaza could use the their western border with Egypt, which in contrary to the Israeli border, the Egyptian is closed most of the time for the same reason - Egypt doesn't accept the terrorist regime in Gaza. Maybe you think Egypt occupies Gaza as well?
Well, except for the airspace and territorial waters, and enforcing it's security zone on the Gaza side of the Oslo Accord demarcation line.