Good work! Nice story, good graphics. The subtitle text (and sound) got very annoying.
I enjoyed the challenge of precision shots. I really was able to use the AI to finish the aliens when I ran out of bullets, really milking the collaboration-bug, making it an important mechanic. (that's is what devs dream of).
Subtitles tip:
Make them entirely skippable with one button.
Programming tip:
The gun would reverse when moveing left. This is probably becuase the aiming code applies to localRotation instead of rotation.
Effects tip: (nit picking)
The smoke from the ship was circular. I reckon using the default sprite square would have matched the pixelly theme better
In summary: Absolutely fantastic! Looking forward to see what you do in future jams.