To provide credit means to let others know that I was the one to draw/create the asset.
Like at the end of a movie where you might see actors credited for the role they played. I just ask that my name be put somewhere in the project/product giving me credit for making the assets that were used.
This is usually done at the end of a game in a credit roll, similar to a movie, but many people decide to put it on a page where the game is downloaded instead.
I ask for proof of this for commercial projects because otherwise I may have to pay to see that it is there at all. So when you publish the game, just tell me where you've put the name "Noraneko Games" in order to say I created assets used. I hope this is helpful and I wish you the best of luck with your project!