New map, new enemy, new controls!

This update also contains a new control schedule - pressing the menu button allows you to strafe! Hold down B plus left/right to strafe once you have switched to "Strafe" mode.

You can now also change the difficulty mid-game - press the menu button to reach this setting as well.

I also added a cool menu animation for the game and fixed a bug that caused the music not to loop.
The game is now also about 30MB smaller than before - I seem to have somehow managed to compress the audio files with the wrong compression :)

Let me know what you think of it!