Some cool sprites!

The stipulation forbidding the resale of the assets is unenforcable. In fact, it is not allowed by the license selected. This isn't because we want others to profit off of your hard work, it's because restrictions like "no reselling" create weird legal problems that make the assets nearly impossible to use, even in non-commercial games. Would you be willing to omit the part about "Reselling of those assets is strictly forbidden"? Until then, I must mark this as having a licensing issue to protect your interests.

With CC-BY, it is actually pretty hard for someone to resell these assets successfully anyway. On any page where they would sell these, they would be requried to have a link back to this page. Their potential customers would see that it is available here for free, and there would be no reason to pay that other person for them. The point is they are still allowed to try to resell it, even if it would not really be effective. :)

EDIT: Fixed, thanks!