Minor Update now available

Corrected a scoring bug that resulted in a "x0" multiplier upon retrying a mission.  A more significant change is player fire is no longer destroyed by large scale enemy fire. This was a mechanic that was a hold over from a much earlier version of the game that just added a needless layer of extra difficulty, the game is much better without it. 

Music is also going to be replaced in a pre-release update to reflect the sound of the final version of the soundtrack.