I've been playing Shadow Tactics: Blades of the Shogun.
It's like XCOM but in real-time, and set in feudal Japan. It's a hell of a lot of fun, and quite challenging. It feels hard, and often I get to parts that are impossible, but then if I walk away for a while suddenly a solution will come to me while I'm doing something else. I'm addicted.
I'm especially glad it's good, because it came in the Humble Bundle that I got for The Long Journey Home, and I ended up not liking TLJH, so I'm glad there's something good in it.