Robot Spider Invasion
    a game by SpiderDave

Main character sprite:
    Balmer
    http://opengameart.org/content/hero-spritesheets-ars-notoria

Persistant Storage code
    MrMagical
    http://pastebin.com/DtWDSWZ4

Intro audio
    StumpyStrust
    http://opengameart.org/content/their-coming-generic-horn-sound

Death scream:
    JohnsonBrandEditing
    (modified)
    https://www.freesound.org/people/JohnsonBrandEditing/sounds/173944/

Walk and land sound effects:
    Kenney (www.kenney.nl)
    http://opengameart.org/content/50-rpg-sound-effects

Spider sounds, player attack:
    artisticdude
    http://opengameart.org/content/rpg-sound-pack
    
Metal spider sounds
    bart
    http://opengameart.org/content/33-metal-clang-sounds-cast-iron-pans
    
Explosion (bomb):
    yd
    http://opengameart.org/content/platformer-sounds-terminal-interaction-door-shots-bang-and-footsteps

Explosion (spiders):
    (modified)
    Werra
    https://www.freesound.org/people/Werra/sounds/244394/

Achievement Unlocked sound:
    wubitog
    http://opengameart.org/content/3-pop-sounds

Zappy weapon sound:
    (edited)
    cormi
    https://www.freesound.org/people/cormi/sounds/93979/