Shielded Cargo: Frontier Defense

As a warmup project for our new class of first year game developers, we had a short 6 hours game jam on the topic of "one button game".

The controlls are quite simple.. You press... well... a button.
It doesn't matter which button you press, any time you press down a key, the shield around your ship will rotate. Every time you press, the shield will rotate in the opposite direction.