Now that I have the core game play set, most of my time has been spent tweaking the spawn rates and times between waves. In previous builds, once you played longer then about a minute, there was no time left between waves. This made the game challenging and quick, but did not give you a reason to actually place down walls because it took too much time. After some tweaking, I have made the time between waves longer, allowing the placement of walls to be used much more often, and giving the walls more of a purpose.
I have also created a new model for the first red trap.
Lastly, I have implemented Google Play Services into the game in the form of leader boards. Achievements are coming soon!