It is finished, but that doesn't mean it is "finished", that this is it. Perhaps in a year or two inspiration will strike, and V1.1 will be made. Maybe there will be a sequel, maybe there will be a remake, maybe there are going to be updates regularly. It is finished in that you can't ask "Where is the rest of it?" as nothing is really missing anymore, an ending has been provided.
Donate money over patreon, don't nag, and hope more gets made, maybe it will, maybe it won't. The more money donated the more likely it is to continue, same deal as with most games on here.