I think you rated it a little harshly
The creator picks the rating right? I'd barely call that Teen material, the only blood in it was black and only for one second and you must be a real prude if you count some forest lady slipping off her shoulder strap as "Mild Nudity". But the movie itself was good, but did you need to focus on the guys nasty gangrenous foot wound for so long? That thing was barf-worthy.