From experience spending extremely large amounts of money: If done right Facebook will win every time. Use targeted mobile app install campaigns, Facebook's bread-and-butter.
Your main problem is going to be that the game is sci-fi themed. They are very hard to marketing. If any perspective developers are reading this, don't make sci-fi themed mobile games.
Your main problem is going to be that the game is sci-fi themed. They are very hard to marketing. If any perspective developers are reading this, don't make sci-fi themed mobile games.