Wow! Amazing. I can't believe you are making all of this great stuff available for free, I just want to say thank you!
I might use a bit of this material, in my indie game 'Miniature Multiverse' and I will be sure to credit you and also give you a free copy at time of launch, as a thank you. I may also be sending a little bit of cash your way through itch at some point maybe, if there is an obvious 'donate' space placed anywhere on your Itch.IO profile.
Anyway... again, thank you.