Single executable file without no source code and no real explanation what is going on behind the scenes? Seems a little sketchy to me. You don't open up .exe files you get sent in emails (if you're smart) so why would this situation be any different?

You're going to find yourself swimming upstream on this one until you release the source code on Github or something, you could have anything lurking in that executable. The product you've created looks great though, I really want to install this and try it out, maybe in a sandboxed environment though.

Do what the developers behind the Popcorn Time movie torrent streaming app did, open source it and let others make it better whilst publicly showing that it is safe.