Wow! looks great, thanks for sharing! ;) 

You should know the "sale is prohibited" stipulation is unenforcable under the CC0 license. In fact, there are no licenses accepted here that forbid sale. Not because we want others to profit off of your work, but because it creates weird loopholes that prevent developers from selling their game if they use these assets... or, sometimes, it prevents them from even putting them on a platform that generates ad revenue (like steam, itch.io, etc.) even if their game is free.

However, if you were to change the license to OGA-BY or CC-BY, anyone trying to sell your assets would be required to credit you and link back to this page. Any potential "customers" of theirs would visit the link, see that the same pack is available here for free, and not bother paying that other person for it. People are essentially never successful at legally reselling free packs that way, but they're still allowed to try.

In order to safeguard your wishes until we know more, we must mark this as having a licensing issue to prevent it from being misused. Please let us know what you decide.

EDIT: Fixed, thanks! :)

That's some pretty great color palette, I love it.