Bought the game via Steam ages ago. Didn't play it much. Costs 20€.
Returned about two weeks ago. Got hooked and haven't done much anything else on my past time than playing it.
It's still in Early Access, been for years I think, but the game is HUGE already! (might cost more after full release [if one comes])
In the game (story), you are some kind of an engineer, who has crash-landed on an nameless planet (I think? [which looks like Earth and has the same resources]). His - your - main mission becomes to collect resources (iron, coal, oil, copper, wood [uranium after an update]), build machines with them, research more complex machinery to build even more complex machines, which in the end call/send a rocket from/to Earth to pick you up and to be sent back home.
There is also combat, since the planet is inhabited by these big bug-like aliens, who doesn't like you polluting the area with your filthy factory.
There are trains to carry around your stuff, a car and a tank to ride around, many things and parts of factory stuff, different turrets to fight the aliens...
There is Multiplayer as well.
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Trailer: https://www.youtube.com/watch?v=DR01YdFtWFI
Gameplay Trailer: https://www.youtube.com/watch?v=KVvXv1Z6EY8
10/10. Definitely worth every €uro.
Very positive reviews at Steam.
Wish someone else bought the game - I have played the game with one friend already, and I can't wait to play with someone again!