Thanks!
The sound effects (minus the background track) was a place the kids got to contribute directly to the assets. Both the alien kill and alien damage effects are the same “Boom” word from my son, with alterations in Audacity. I was especially happy with how the getting hurt sounded because it reminds me so much of Crystalis(1990) for the NES.
The rocket launch sound was from three of us performing while we watched the cut scene.