Absolutely love the game, can't wait for the final version. Just finished the game on nightmare difficulty and noticed a couple things. First one is the raids on the entrance stop at about day 2000. Maybe you already know and set it up that way, just think it would keep the difficulty up if they kept coming. The other one is that when I was down on the bottom level and tried to call troops, miners or engineers down from the first floor they wouldn't come. I had to guide them down the first couple of floors before they would do it on their own. Neither one is a big deal or changes my opinion of the game. Thanks for the fun