You can 100% use these in any commercial project without worry! Credit is not needed but always welcome! However you want to credit is fine with me. I would also love to see what you end up creating using these guys as well \0/ Glad they work out for you and that you like them
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