It's a nice side scrolling FPs defense game. Simple, straight forward, nice use of a "Tech Tree" to upgrade weapons without using game cash. But there were a few things. The aiming can sometimes cause lag and can cause the loss of control. Trying to aim down the sight, move, and shoot causes the game to lag and, like I said, causes you to lose control of what you're doing. But I do like how not all the maps are the same. It's not you defending the same objective for hours on end. And getting a new weapon every few levels instead of charging ludicrous amounts of in game money for something that may not even be effective against a particular alien. It's a nice game. Just has a few things that'd be nice to fix up.