I just wanted to thank you for using CC0 rather than some home-made "don't redistribute or resell" license.
It means I can add it to my list of art assets which wouldn't be a blocker to getting any resulting open-source game into Linux package repositories.
(Up until now, I've focused on writing utilities, but I collect assets because, if I can find time, I've always wanted to experiment with things like better procedural level generation.)