Yes of course you can use them! The redistribution refers to reselling the cards somewhere else (for example: making a new itch posting with the same cards). Also thank you for the nice words!
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Thanks for contributing to this project. If you want to try it, here is the link: https://lucambr0.github.io/DeckSpace/ It works best on Android devices, where you can install it as a webapp. If you are interested in how it works, here is the documentation: https://github.com/lucAmbr0/DeckSpace, you can check the credits in "About" inside the app or in the documentation