1. You're allowed to do that as long as you credit me. but if you're making a fanmade and playable sprunki mod, please also credit So Far So Good for creating Incredibox.
2. I do not have an official sprunki focused website, and there is no official upload of sprunki avalible publically. I assume you found a website that uploaded my project without permission.
Please credit me for making sprunki and if you can, link my itch.io account for the others to play my project. And if you're playing the actual sprunki project, also credit So Far So Good for making incredibox.