• python 2.x
• numpy or scipy libraries
• pygame 1.9 or above

• Vec2d.py from the pygame wiki (source)
• Shadows.py from the pygame wiki (source)
• The creeps (source inspiration) from http://eli.thegreenplace.net/2008/12/13/writing-a-game-in-python-with-pygame-part-i/
• The game Loveless, by Monokey (inspiration): https://www.allegro.cc/depot/Loveless
• The Resources cache: http://stackoverflow.com/questions/17615447/pre-loading-images-pygame

The source code (except Shadows.py and Vec2d.py) is licensed as GPLv3, and the file COPYING contains the full text of the license.

The files Shadows.py and Vec2d.py are in the public domain, see the beginning of those files

All graphics and images used in this game are licensed under CC-BY-SA 3.0, with some exceptions noted below. You can read the full license text here: http://creativecommons.org/licenses/by-sa/3.0/, but in short the license means this:

You are free:
    to share – to copy, distribute and transmit the work
    to remix – to adapt the work

Under the following conditions:

    attribution – You must attribute the work in the manner specified by the
                  author or licensor (but not in any way that suggests that 
                  they endorse you or your use of the work).
    share alike – If you alter, transform, or build upon this work, you may 
                  distribute the resulting work only under the same or 
                  similar license to this one.

• The crate is placed in the public domain

• Kaboldy (http://commons.wikimedia.org/wiki/User:Kaboldy) for Gripen and X47-B
• mysid (https://en.wikipedia.org/wiki/User:Mysid) for the keyboard.
• Font Awesome by Dave Gandy - http://fortawesome.github.com/Font-Awesome for the heart

Music by http://www.pacdv.com/sounds/. See their webpage for details on usage of their tracks.

Sound effects are created by myself using the sfxr utility, which can be found here: http://www.drpetter.se/project_sfxr.html. They are also under CC-BY-SA

pippy in #pygame on freenode, for helping debugging delays in sound effects.

kalaset, Jaycop and sholm in #monaden on freenode, for testing the game, and for suggesting improvements (shadows were sholm's idea)

lumi for his shoot-em-up expertise (without him - no hitbox!)