I listened to Summer Said only, so my viewpoint and criticism might be slightly biased towards your musical capabilities and playing.

You do pretty decent vocals and play the guitar relatively well. If I were you, though, I'd incorporate another instrument into your group. Probably bass or drums to fill in the absence of rhythm, so your overall playing doesn't sound as musically numb.

I don't think your playing and vocals are the problem, but the presence of other instruments.