May I use these for commercial use? The license and README doesn't state that it is not okay for commercial use.
Viewing post in 16x16 RPG character sprite sheet comments
https://creativecommons.org/licenses/by-sa/3.0/
Under this license, you are free to:
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material for any purpose, even commercially.