A nice folky sound, and bare-bones performance. The lyric video is fine, all you need unless you WANT that much higher resolution. The mix is actually good, and the recording quality would be excellent if you could get rid of the low-mid hum.
Using some basic recording apps and a few bucks of gear (a tiny mixer if your hands-free jack only accepts mono audio in and two cheap decent condenser mics, or just the mics run into a stereo plug if that's allowed by your phone) might do exactly that- you can keep the mic sensitivity low to suppress ambient noise (sometimes high-end mics are MUCH more trouble than they're worth, as they're TOO sensitive), but give you plenty of signal when close-micing. Since you're adding reverb, good, clean raw input is what you need.