There's a new paradigm in strategy games. Whereas the old guard in real-time titles like Starcraft, Age of Empires, and Command & Conquer tended to get more complex with each release, the point of Auralux and its imitators is to boil strategy down to its purest components. It does so by making offense, defense, and resource gathering all more or less the same game mechanic, in the tradition of Galactic Conquest (AKA Galcon). Now the sequel to Auralux is out, and it's looking pretty great.
Auralux Constellations features the super-simple, planet-to-planet strategy that fans have loved since its original release. But the new version includes 150 single-player levels, online multiplayer, and new map elements to play with. The game also supports 4K graphics natively, which is especially handy if you're playing in on Android TV. And if you are, Constellations supports local multiplayer for up to four people on the same TV. Nice. Playing on the NVIDIA SHIELD grants access to two free multiplayer maps, which is also nice, but only for SHIELD owners.
Constellations is free on Android with in-app purchases for levels that go up to ten bucks, which seems more than reasonable. (The Steam version for PCs is a flat ten bucks.) It's compatible with phones, tablets, and Android TV devices running 4.0 or higher.