quinston/summative2011 — comment on commit 8bf0eb7fb71a84ea9b45c108a2f6ac5ab6cbd105
File:  line 0
By quinston:

Also:
consider adding the saucer that flies across the screen in the back and when shot restores shields
consider causing the explosion sprite to replace the alien when it is killed
* I added a red tint to signify damage