Hmm I've noticed the sound corruption.
As for the invaders and player becoming invincible... I think that's because I didn't think people would get that far into the game. Adding a limit for the invaders starting position and speed - plus reducing the triggering of the sound with the invaders movement should help no end.
Shame really, as that section of the game was finished in January and there has been a demo on site since then. There is something to be said for having a testing department.My test team consists really of my daughter, who just laughs and calls me sad (I won't even repeat what she said about ELITE, I've dis-owned her

) !
I will start looking into this later today, thanks for the feedback Sam,
Neil