Game Assets

I have a scroll interactive nft website, the concept is that the website is like a platformer game and as you scroll the avatar moves and by the end of the scroll you reach the ending of the game, now i want to change all the graphics, a complete reskin, there are 120 assets some will stay some will have to be replaced, also I need this in 3 days max, you can look for assets online i dont have a preblem as long as I can have ownership of the copyright.