What on earth is this game even about, and is it even worth considering buying?

It's a sandbox adventure game with a sci-fi/dystopian/near future setting. You are free to explore the game and do the task the game has to offer. By the end of the game, your overall performance will be evaluated with VP-based scoring.

Check out the manual for Android right here on the FFG.com web site.
Android Manual

And have a look at the details and comments at BGG.com .

Start with the manual. It will give you the theme and rules. Then head over to BGG.com for extra thoughts on the game.