Song
    Gran Batalla by Mekathratos
    Released under CC-BY-SA 3.0

Voice acting
    by Viktor Aurelius
    released under CC-BY-SA 3.0

Spaceship.ogg
    by Marianne Gagnon
    released under CC-BY-SA 3.0
    based on CC0 sounds by Heigh-hoo and scarbelly25
        http://www.freesound.org/people/scarbelly25/sounds/33943/
        http://www.freesound.org/people/Heigh-hoo/sounds/63259/