Thank you!
Under "More information" it shows the license. It's available as: "Creative Commons Zero v1.0 Universal" which as far as I can tell is the closest I can get to releasing it into the public domain.
My intent is that you can do whatever you want with it, no credit necessary! Very glad if someone finds it useful!
Update: I would love to hear if you have a use for it, but because I want to play your games!