These graphics were made by Nicolás A. Ortega (Deathsbreed), however, copyright belongs to the DeathsbreedGames organization (http://deathsbreedgames.github.io/). All works are licensed with the CC-BY-SA license. If these files are being distributed in the form of a game that uses an open-source license, you may (out of convenience for space) credit these works in the source-code instead of the binary. To clarify, if your game is open-source you can credit this work either only in the source-code, or in both the source-code and the binary (on the credits page), but both is preferred.