Can you clear the asteroid field before your shields fail? Use left and right arrows to pivot, use A to accelerate in a direction, and use B to launch a missile. Your shields can take nine hits.
To fit this program in 24 lines, I had to leave out the score display. If you have the purchased version of LowRes Coder, add this statement before the WAIT 0.1 command:
Get LowRes Coder to use this program.