Dota 2 is a fast-paced first person shooter with some RPG elements mixed in. In all my years of playing indie games, I have never seen a better real time strategy game. For a space travel simulator, its lacking in rocketships, but overall, it is one of the greatest zombie survival game on the market. If you could possibly desire a better game, then you should think about purchasing Drake of the 99 Dragons. Both it and Dota 2 share many similarites.