If you want to use stems and make a remix in a genre different from chill (such as EDM, Techno, House, Dubstep, etc.) - you can freely do that, it just won't be eligible for competition.
​But you can post your remix on your social channels (Soundcloud, Youtube, Audius). Remix must be titled properly: "Anna B May - Into The Woods (Artist remix)". Please use cover art subfolder in remix stems files to make your own cover art for your post.