I honestly LOVE this season so far. The pmines are an amazing mechanic, and they are very helpful for leveling up your pick, and getting ores/tokens faster. I also love how they still have most of the other things that made last season interesting, but they basically "spiced" it up a little bit. Great job Alex and the developing team!
Oh, and to add on to that, I also think the boosters are really good, I'm not a big fan of the one they added this season, but I'm really happy they kept the new ones they added last season. (I also like the changes to the upgradeable pickaxe and how you can see specific stats on it when you right click, and that you have to do a lot more stuff to upgrade your pick so it's a lot harder to accidentally upgrade it.