I'm going to be a dick here, because someone will say it anyways, but how is this different from VIM's directory browser? Essentially the same UI. I do think your program does add some features not found in VIM.
Also netrw is a bit of a mess; I once found a bug and thought "I'll write a patch". After five minutes of browsing through the code ([insert Eddie Murphy meme]): "yeah, never mind".