These sprites were designed by Jacob Zinman-Jeanes (http://jeanes.co) for Gamedevtuts+ (http://gamedev.tutsplus.com/).

To find out more about what's in this mini sprite pack, check out this post: http://gamedev.tutsplus.com/articles/news/enjoy-these-totally-free-space-based-shoot-em-up-sprites/

These sprites are licensed under the CC BY 3.0 license: http://creativecommons.org/licenses/by/3.0/