If you are looking to "develop a feature" in the style of 2016-era Factorio, the focus should be on , logistics , and high-performance engineering . Key Features Developed in 2016
This year saw the expansion of the circuit system, allowing players to connect machines with wires to create complex logic, such as disabling a belt if a chest is full. Factorio (2016)
The introduction of realistic fire spreading and high-impact combat tools for defending the factory against "Biters". If you are looking to "develop a feature"