Even though you don't like fighting, you are forced to defend yourself. Using the parts salvaged from your crashed space ship you create new weapons to help defend yourself. Place your defensive troops strategically and start the next wave: will you be able to keep the monsters away from your space ship?
1-6 = create weapons,
Space = cancel place defensive units,
W = start a wave,
E (hold) = view line of fire,
R = reuse weapon.