1 Like the progression system. It seems well thought out and, once understood, gives the player a lot of freedom on how they want to play.

2 Random world generation keeps the game feeling fresh. Each seed presents a unique world to find solutions for easier progress. What resources you can get, and when, play a big part in how you can play that world. My last world I just had to deal with not finding the trader.

3 It isn't overly complex. There are not a million different things in each category. You don't need a guide to figure out a "meta" build. It is just what it is. Not a lot of junk to just clutter up everything or make choosing between things difficult.