I've been playing the second game, and came back to play this one. It's quite good: good story, decent graphics, plenty of missions. But the major thing for me with this game is that, with the bosses, you need to use a lot of resources to beat them-meaning that you may have to wait to make lots of grenades and medkits-or you can simply go to the store and use real money. This game isn't all pay to win,but it's definitely challenging if you don't spend money to progress.
Evolution: Battle for Utopia at Google Play market analyse