The game uses several open-source libraries and resources which are as follows:
The game is built on the LWJGL and Slick2D libraries, both of which are released under the BSD license.
The fonts used in the game are from the Fira Sans set, which was released under the Apache License as part of the Firefox OS project.
Icons in the src/res/icons directory are from the Silk icon set by Mark James. This work is licensed under a Creative Commons Attribution 2.5 License.
We also use Creative Commons images as backgrounds on various game screens:
The background image on menu screens is a cropped version of Dark Clouds by comedynose.
The background image on the Game Over screen is a cropped version of War of the Worlds - Plane Crash Set by Rob Young.