It's released under the MIT license for the code and a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported license for most of the assets. You can get the details - and the code - on GitHub. You can still buy the game by clicking this well-crafted link.
And remember: hover-elephant is watching.
![](https://media.moddb.com/images/articles/1/140/139387/auto/wubwubwub.png)