Your only chance of survival is to reach launch pad XV-238, located at the control base of the schizophrenic assassin Professor McJerin, and escape to the outer colonies. The path will not be easy.
https://www.youtube.com/watch?v=swSQs8X65X0
One of the first Dinamic games I ever played, I think... I was quite late getting into Army Moves / Navy Moves, etc. I don't think I ever got to finish part two come to think of it. You made part 1 look quite easy finishing it on one life. :)
Yes, the other longplays I've seen usually loose one life at the third sector to start again plenty of life. When I was young I could finish the second load but never the first one.