intro:
(space+n) key - bomb negs
(space+x) key -
super
laser
(z)
key - shield from rocks
(space) key - laser
customize
feature:
click on 'customize'
button,then,
(right click) - create an alien
(left click) - create an bunker.
then, click on 'start-customize' button for start
please choose level option to start