As someone with over 600 hours into this game, I can say with 100% certainty, that it is worth your money to buy!
Thank you factorio devs for creating a drug that has no side effects besides sleep deprivation.
And they're based as well, continue to do what you do, we'll support you through thick and thin!
Now I am off to dive back into the crac- I mean, the belts, yes! The belts...

I have played WoT(World of Tanks) and it very much has that same feel, just more in-depth with custom vehicles.
It can be fun, but the thing that made me hate this damn game, is:

1: The limit and huge grind on resources.
2: You can craft unlimited common, or garbage parts, basically. Except you CAN'T craft any armor parts, just everything else that has no point in crafting, since you can win it from battles...
3: You can craft rare parts, a tier above common, but they are literally forcing you to buy in-game money to let you be able to do so. You cannot craft any rare parts AT ALL unless you spend 5 in-game credits, which to get for free, would require selling scrap metal, which is vital to crafting itself, it's counter-productive!
4: Oh, you ALSO need previous common parts along with scrap metal and copper to get those rare parts!
5: It updates through their own launcher, which wouldn't be an issue, if the torrent didn't act like an illegal one, it will shut down your net on every second try. Seriously, what are you devs thinking?!

And finally, the biggest thing that made me flip off this game so hard...

6: The servers are absolute, total garbage! If you're not playing on the weekend, it can be fine, but during so, you are rubberbanding like a madman, and CANNOT do anything! It might be more apparent for low net speed people, but still, this is the biggest issue, I might not continue to play because of this especially, along with all the other issues!

I like this idea, very much, but either the devs don't give a damn, don't know what they are doing, or are under so many limitations, that this game will die off, and probably has already.
If you devs are reading this, then get your act together, ignore the kids complaining about content, and fix these real issues! There is plenty of content, but barely anyone can reach it with all of these real issues, only kids with so much free-time maybe, but that's not how you make a game that people will play! I want this game to be good, I'd want to play it more than WoT, but not until you fix it up, damn it!

Oh, I forgot to put in what would fix at least a couple of issues:
1: Instead of having a daily scrap limit, make it so people can earn a bigger amount of scrap from the start, say, 10-50 scrap per victory, and 5-20 per loss, and when it hits a daily amount, they earn less, like the reputation / exp. It makes it easier for those that play casually / on very little free-time, and it encourages playing to a semi-limit.

2: At least make 10 rare parts buildable from the start and then force to buy additional slots.

3: And stop asking for so many common parts, along with already scrap AND copper! Limit it to 2 or 3 common parts in total, and keep the scrap and copper low. Again, there are people that wish to play for a short amount of time, they don't have all day to grind JUST for ONE part!