Yep! You can modify them however you want
im using your assets in my current game 
https://vishwajeetgautam99.wixsite.com/winzstudios/post/template-product-review
and crediting your right here too! thanks! ill credit you in my indie game too once it's published ;) should I put your real name or something behind your itch page? would be cool for me too xD