It it weren't for the co-op this game would have been so much worse. It's a very repetitive game-play.
The goal is to protect your base from enemies and when you finish the level you do exactly the same thing over and over again. You have 3 different bases in the game and you spend your time protecting them (one at the time).
The goal is to protect your base from enemies and when you finish the level you do exactly the same thing over and over again. You have 3 different bases in the game and you spend your time protecting them (one at the time).