Hi,
The game is supposed to be hard when starting for you to learn mechanics, events, actions etc.
During the run each person you meet is an enemy and you simply have to fight them to win. Winning gives you credits, upgrade materials and other valuable findings. In between fights there's a chance to find a study book, which used in the morning will increase your base stats - those give you higher chances of successfully performing actions during fights.
Treat it as an rpg element inside a porn game.
Cheers