>>118873you spawn in a world using a random seed (think minecraft), you start by crafting shit manually, but after a while you make conveyor belts to transport iron, copper, whatever to your furnaces to make plates, plates to make flying robots to replace your conveyor belts if you want, you can make blueprints for your robots to build layouts of miners for you that you have previously manufactured automatically with said iron.
Its very deep, if you try to optimise everything. It is kind of like a 2d tekkit, FTB.