I would have given this 5 stars, until I got to campaign 3. On the large desert world of campaign 3, with multiples portals of enemies during monster waves, the lag makes it near impossible to play. Once I made the mistake of turning the game off during a master wave, and then it was permanently frozen, would not load again at all. I started over on campaign 3 and made sure to never turn off the game during a wave. Now, as I have explored and mined more of the world, the lag is constant and makes playing the game an unpleasant experience. I emailed support over a week ago to ask if they have any solutions that might help with the lag problem, and I have not received a response back beyond the auto response that my message was received. My device is not that old, so its not an issue with the hardware. They need to do something about the lag in campaign 3. If the lagging was resolved, I would give the game 5 stars. Its a very fun game UNTIL you get to the point where the lag becomes unbearable.