I Am Really the Captain of the Flying Henan People

"The whole world found they had traveled in time after waking up one day.
Eight billion human beings woke up and found sharks had become their neighbors, and their only shelter was the wooden raft under their feet. What floated towards them included not only objects from shipwrecks but also numerous monsters lurking in the sea.
Grilling Kelps, Rum, Great White Sharks, Former Dominators...
Fortunately, Chen Chang'an used a cheating program. As long as he had enough surviving points, he would be able to upgrade items such as knives, artilleries, and even nuclear weapons. They could all be upgraded to more cutting-edge technologies.
Wooden Raft -> Black-awning Boat -> Ghost Ship ... Aircraft Carrier
Wooden Axe -> Opening Mountain Axe -> Storm·Opening Mountain Axe ... Magic Opening Sky Axe
One year later, when the others were still struggling to survive, Chen Chang'an had started to conquer the undersea world in magic attire.
""We are rowing a bathtub, but he is driving an aircraft carrier!""
""And there are two fair-skinned pretty mermaid sisters on the ship. They look delicate and touching."""