Spice Invaderz release 1.02

Small update.   I was able to optimise the alien fire routine and gained 2k of space back.

With spare space, I implemented a Save feature for the Hi Score and options selected.

Increased the wave patterns to 9 unique patterns.

Added an indestructible homing missile from the Alien mother ship (felt the game was a little too easy so this helps balance things out)

Dont stand still else alien mothership will get a lock on you and send down a homing missile that can then only be dodged to avoid being killed.