You make decisions that affect three key parameters: health, mood, and satiety. Work, buy food, make friends, buy housing and transport, accumulate experience and money. Balance between work, rest, and personal life, so as not to drive yourself into depression or debt.
Every action is a step in one direction or another. Whether you will invest, be lazy, watch your diet, or waste your life depends only on you.
Become who you want. But remember: time is your main resource.
Earn, spend, survive. Like in life, but with a restart button.