Hi! Thank you for your question! It basically means this:
You may recolor/adjust/add sprites to your liking and use them in private or commercial games.
You can use the sprites for making paid or free games.
YOU CANNOT: RESELL THIS PRODUCT AS ANOTHER TILE SET. OR USE THE IMAGES FOR SELLING IN MEDIA OR ANY PHYICAL PRODUCT.
Sorry I know license can be confusing! In the future I will just post the explanation above:))))