(The legal text is below, this is a summary and not part of the legal text.)
Basically, feel free to take the code and use it for your own projects, build on it, patch it, sell it, as long as you don't sue me if it breaks horribly. Those parts of the audio and images I made myself you can use and build on for non-commercial purposes. All other audio and images have whatever licensing terms they came with in the first place.
(End summary.)
The MIT License (MIT)
Copyright (c) 2013 David Stark
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Assets license (all .ogg and .png files, excepting additional graphics listed in the intro)
All assets are released under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported license.