I saw someone else ask this and the only thing I retained from that plurk is "every content warning known to humanity"

the worst guy ever tries to be a hero.

he remains. the worst guy ever.

the game is playing out and experiencing his delusions about that.

serious answer: a space freighter with a crew of five is deliberately crashed into an asteroid and is stranded in space. the game cuts between before and after the crash as things spiral out of control and you figure out the reasons for the crash and what happened afterwards

the mummy is what's left of the original captain after the crash