In the Apocalypse, I Can Rewind Time

I thought this would be an everyday story set in a parallel world, but it turned out to be a world facing an apocalypse.

The apocalypse will arrive in seven days. As an ordinary person, how many days can you survive?

Day one: The front door is smashed open, and a horde of zombies rushes in.

First survival trial over. Days lived: 1. Rating: Fail...

It's really hard for an ordinary person to survive in this apocalyptic world.

Fortunately, you get a reward after every trial.

Reward: one D-rank chest.

First trial completed. Level +1, chest upgraded to C-rank.

Ding! First chest opened. Level automatically +1. Choose one: Infinite-ammo Gatling gun, Rare; Golden electric mouse, Rare; Sword Intent, Epic.

Each trial awards one chest. Items obtained can be brought into the next trial. The longer you survive, the greater the rewards. If you die, you can start over.

When my life becomes a single-player RPG where I can stack skills and items, what could possibly stop me from becoming a god?

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Please do not imitate.