Still here? OK. So the game is 3 parts "defend earth from aliens tycoon" and 2 parts "turn based tactical strategy"! The tycoon part presents you with the planet earth, where you can build bases, ufo scrap yards, radars, defense turrets. The goal is to defend all the nations from the threat of aliens. The bases you build need to have command centers and alien containment places and living quarters and power generators. Once you have the separate buildings you need employees to do research and to produce weapons and aircrafts.
You can also build interceptors to attempt to shoot down alien craft before they land, but I haven't managed to consistently do that so good luck.
There are some bugs in the game, but it is stable-ish! Give it a try, it is worth it.