I can use and I can sell my game on EpicStore or itch.io any site use your asset? Of course I give you credit. I promise you
Yes, the assets are licensed under CC1.0 Universal so, you are free to use the assets in anyway you like (Commercial use included).
To clarify, yes you can sell your game where ever and how ever way you like. You can refer CC1.0 terms here: https://creativecommons.org/publicdomain/zero/1.0/?ref=chooser-v1
][