I saw this game Factorio pop up in my big Steam game slideshow the other day and had to check out what it was (if only to figure out what the game's name actually was since it looked more like Factor:0 in their typeface).
Anyway, after checking out this sweet trailer
I was definitely intrigued. It looks like some sort of insane infinite 2D version of Infinifactory or something. Build an ever sprawling automated infrastructure of machines, factories and transport to harvest various resources, build parts, move them around, create energy, etc.
Here's a little more in depth gameplay trailer
as well if that intrigues you.
It's currently sitting at 99% positive reviews on Steam with over 2400 reviews. Maybe not surprising since they've apparently been in an unofficial early access mode and had already sold over 100k copies on their website before coming to Steam, but extremely impressive nonetheless!