Hello howo, did play factorio last year and spend hundred of hours. What a great game ! It's not an AAA but got some serious quality.
I did find it pretty challenging and it's very difficult to think about everything, there are so many thing to do at the same time ...
I did not finish the rocket but just the campaign took me some long and cool hours. Can't recount the number of times i was forced to rebuild everything because my installation was design too badly.