My most favorite game. Just buy it!

This is a great example how early access can work and evolve over time and you really get something good for your money.
I played the game probably over 500 hours before it hit Steam and I still love it after 2000 hours of playtime. It has very great modding support and a lot of players wrote great mods like I did. The community is great towards new and old players and is very forgiving, explains stuff and always optimizes your build. The developers regularly update the game with bug fixes and new content for regular players and Modders.

PS: Yearly steam awards edit. Before editing I had 877.7 hrs at review time.