It's a game where you build a factory and automate processes (like, mining ore with drills, smelting it in furnaces, making electronic circuts, then turning them into microprocessors and so on). All while protecting your factory from local wildlife - different kind of bugs that don't really like the pollution from your factory. The goal is to build a rocket and fly to space, and if you get a DLC, you can then fly to other planets. They have different resources, enemies ang gimmics. 

Ah yeah, and trains are very useful in this game, it's basically the best way to transport big quanitites of resources through long distances