I'll start with a general disclaimer for what you're looking for in feedback. When you get a "crickets" or a polite "looks promising" response, it indicates you

I'll start with a general disclaimer for what you're looking for in feedback. When you get a "crickets" or a polite "looks promising" response, it indicates you are currently missing the mark, either in the concept or the marketing(and the two are very, very intermingled). There's a dramatic, intangible, "know it when you see it" difference when something gets the response you need to achieve some real growth. And you do need the broad audience to be sure, because in private, a small group of people can convince themselves to believe anything, no matter how "outsider" they might be to begin with. Why not, instead of finishing the code, make a video, or at least a nice landing page demonstrating what you intend to build?