Looking at old forum posts, it seems that there used to be more categories, but currently unless i'm stupid and I don't see them there's only the tutorial. Why is that?? I can think of plenty of categories that'd be great for iron snout, and I think it's a bit of a shame to only have the tutorial

The other categories are currently under the "secondary categories" tab. If you click the arrow above where it says "Submit Run," you should be able to see them.

OHHHH thank you so much! Had no idea haha