It's not a bad game. But my god.... this has been done before so many times. I don't see much orginal here in comparison to other TD games. Even worse.. a lot of this is a shameless copy of bloons. A turret shooting 8 spikes? The helicopter turret? The turret following your mouse? The carrier aliens? You must have spend a lot of time on this so it's a shame you didn't come up with a more original concept before you started making this.