Sound Loops and Attack Waves

Added a couple more sound effects (interceptor engine hum and flip whooshes). Built the code to handle sound loops to integrate the former.

Also (and more fun!) added a lot more attack waves. The game has about 70 seconds of gameplay now and it's actually working pretty well synchronising the attacks to the music. It's pretty hectic and tough towards the end as the music builds up. When I implement difficulty levels, the current level is likely to be 'Hard'.

I planned to link in another video when I wrote this post, but it's still uploading to YouTube. I really need to do some compression before uploading...

Here are a couple of screenshots in the meantime: