Everything that Letterboxd says Roger Corman had a hand in, be it directing through art direction, excluding documentaries and TV shows where he appears as an "actor". I think that's a different kind of thing.
Made this list so I can filter it to anything I can get my hands on easily and check it out. List is updated periodically when I think of it.
Films are not in a particular order except Piranha is first so that it's the poster for the list, because it's MY favorite.
So far.