That clip is entirely acceptable as a demo. It provides a good idea of your skill as a singer and guitar player.

But I'm hearing two technical problems: first, the vocal has more "boomy" room noise than it should. I'm guessing that you used an omni-directional (non directional) microphone that picked up some echoes from walls and ceilings, along with the direct sound from your mouth. You can solve that by using a directional (cardioid) microphone pointed at your mouth from about a foot away, and by eliminating the resonance in the room with a rug on the floor and some kind of sound-absorbing material between you and the walls.

And second, there's some sibillance on some of your "ess" sounds, especially on "ssssomewhere in the middle of America..." Again, it's probably a microphone problem -- some are more sensitive to sibilant sounds than others -- that a different microphone could solve. Try keeping the mic away from your mouth and sing across it rather than straight into it. If you have a choice, you might try using a ribbon or dynamic mike on your vocal instead of the condensor that I'm guessing you used on this demo.