The Reckoning Day

The main character is thrown out of the car to floating island. He discovers that there is nothing but two trees and ground with rocks. Soon he finds a car with compartment for some subjects and the note that says about big debts that you need to pay working on this island. Good news is that for some resources the company gives subjects that can make life easier. Bad news - there is lack of resources to pay your debt, but payment is bigger day by day. Your task is to learn how to reproduce resources and pay all debts or find another way to leave the island.