A game made for a high school English class. You can read more about the game here, or more about its open-sourceness here.
The assets included in this source release shouldn't be used. I don't remember the sources for most of these assets, and I certainly don't remember what license they were under, if any. The song is absolutely not under any sort of proper license, since I don't have a license to the song "Samurai" by FCF, nor the voice clips from Mel Gibson's Hamlet.
The code itself is licensed under the GNU GPL v3. If you don't already know what this entails, you can read all about it on the opensource.org page.