Code:

GPLv3, WTFPL (for the changes)


Textures:

CC-SA, WTFPL (for the changes)


Sounds:

CC by 3.0:

— http://www.freesound.org/people/dobroide/sounds/95698/
— http://www.freesound.org/people/Kyster/sounds/79114/
— http://www.freesound.org/people/Kyster/sounds/82275/


Sampling Plus 1.0

— http://www.freesound.org/people/oliver%20eye/sounds/56380/


Unknown License:

— irc(freenode.net)
— footstep sounds edited from default gravel sounds