Xenonauts is a UFO:EU-inspired turn-based tactical strategy game set during the Cold War.
The game begins in 1979, when the player is tasked with leading a joint NATO/USSR task force formed in response to a mysterious alien threat. The player is responsible for managing every level of the organization, from constructing bases and researching new technology, to deploying and commanding fighters, to directing individual soldiers on the battlefield in turn-based combat.
Aesthetically, the game has a unique, classy visual identity, great sound design, and a superb soundtrack.
Gameplay-wise, the game is of course similar to its inspiration, X-COM (or UFO: Enemy Unknown), but with rebalanced combat, a vastly superior interface, added mechanics (such as suppression), and real-time air combat.
If you're a new player who was at some point intimidated by the original X-COM's initial lack of direction and micromanagement, or a fan of Firaxis' XCOM looking for a different experience, definitely give Xenonauts a try. It has all the depth and fun of the original X-COM but with almost all of the micromanagement stripped out and a clearer, more presentable interface.
If you're a UFO:EU vet, you'll find something new here. For instance, unlike in UFO, combat armor is extremely valuable, but also heavy, so if you want to follow the tried and true strategy of blowing everything up with C4 you'll have to pay for it in either survivability or mobility. Running out of ammunition can be a very real concern. Suppression and improved alien AI moves the gameplay away from massed reaction fire toward more dynamic "fire and maneuver"-style gameplay.
The best thing about Xenonauts is its ability to remain "faithful" to UFO:EU without feeling like a nostalgia-driven fan remake of an older game. Xenonauts is not afraid to make changes to the formula if they benefit the overall game, nor is it trying to "recapture" the greatness of its idol. Xenonauts wants to forge its own identity as a bleak, uncompromising, tense, occasionally terrifying strategy game. And it largely succeeds.
Very much recommended.