Thank you for your comment!
I will answer your question.
Part of this tileset is conscious of the format of the RPG Maker, so I think it can be used in the RPG Maker.
In addition, there are no usage restrictions for RPG Maker and other game engines.
That's good to know. Because I want to use them in the classes that I am starting at the Boys & Girls Club here in the town I live in. I will make sure that any games will have a credit for you and your site here. And would it be okay if I linked your itch.io site on both my youtube channel, but a couple of other websites that I manage?