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
please forgive me. I am really so sorry... Its Your Original Work (Please don't think bad Idea I am afraid for copyrights)?
You can. It is specificly stated that it can be used in commercial project, without credit. Though I suggest you give credit, because you are using their work. They deserve it.
