Features Implemented:
- Sound effects
- Settings menu screen that includes the sound effect toggle and the swap movement/shoot keys toggle (for lefties).
- Introduced the mighty "armored snipe" (has a helmet and requires more hits to kill). The armored snipes doesn't appear until level 4, where they take 2 hits to kill. At level 10, some require 3 hits to kill. This will help balance the power of each side.
- Decreased the "power ball" power-up duration to 20 seconds to help balance the power a bit.