Brown Dust is now officially available globally for the Android and iOS platforms. The game has been quite a hit even when it was just out in Southeast Asia, so it would be interesting to see its popularity spreads to other regions.
The biggest draw of this free-to-play tactical RPG would be the sheer amount of things to do. With over 300 mercenaries to recruit and over 1,200 battles to partake in, you will be kept really busy. Once you have familiarised with the basics in the lengthy campaign, you will also be able to engage in PVP in the form of a seasonal guild war.
The usual gacha mechanics are present, which you are going to need to bolster your army. That said, free units offer quite a bit of mileage too, so you are not necessarily compelled to spend. In any case, be sure to try out the game for yourself now that it is out.