I bought Factorio a couple years ago and played for about 4 hours. I thought it was pretty fun but I didn't really get hooked or anything so it sat in my Steam library for a while.

Early last summer I gave it another go and something finally clicked. I probably spent a whole month doing nothing but play Factorio when I wasn't eating sleeping or working. My wife was concerned. It was by far my most played game last year and it's now probably one of my favorite games ever.

If you're into programming or dev ops it definitely aligns with that mindset once you get deep enough in the game you start seeing the patterns and trying to optimize your factory design. But that sort of game isn't for everyone.