In the Last Days, I Can Go Back

I thought it was daily life in a parallel world, but it turned out to be a world of doomsday crisis. Seven days later, the doomsday is coming. As an ordinary person, how long can you survive this doomsday? On the first day, the door was broken open and a bunch of zombies rushed in. End of the first survival experience: 1 life day, evaluation: failed... It is really difficult for ordinary people to survive in this apocalyptic world. Fortunately, after each experience, you will receive rewards. Reward: A D-level treasure chest. First experience, level +1, treasure chest upgraded to level C. Bite! When you open the treasure chest for the first time, the level will be automatically +1. Choose one beforehand: infinite bullet Gatling rare, golden-haired electric mouse rare, and sword intention epic. For each experience, you can get a treasure chest, and the items you open can be brought to the next experience. The longer the experience, the higher the reward, and you can start over after death. When my life becomes a stand-alone RPG that can accumulate skills and items, what else can stop me from becoming a god? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.