Recs.
Updated
Factorio is a 2D game about building factories on an alien planet. You will be mining resources, researching technologies, building infrastructure, automating production and fighting alien enemies. The core mechanic being that users need to find resources in order to create factory parts in order to create even more complex machines.
SpecsUpdate
Pros
Pro Cooperative or PvP building
Factorio also supports multiplayer, allowing many players to cooperate and assist each other, or work against each other in PvP. By default, multiplayer games run the CO-OP freeplay scenario where all players work together to launch a rocket with a satellite into space.
Cons
Con Can become rather repetitive
There's really little payoff for being able to build really long chains of automation, it usually results in being able to open a new tech tree which allows the player to continue the process of building automation chains ad infinitum, which admittedly can become rather boring after a while.
Con Still in early access
The game is still in Early Access even though it's pretty much functional like a full game. This causes people to either not adopt it because they wait until it is released, or adopt it early and get burnt out before it's officially released fragmenting the potential player-base.