If you practice a bit you probably can get the maximum out of your voice. You don`t have a totally unique voice, but it has something, you don`t get false and stay in tune. But it can improve.
The chord at 0:49 is pretty strange. The riff after that is pretty good and catchy.
The part at 2:08 isn`t so good because it doesn`t has the power it has if it were with a total band. And please avoid that cliché ritenuto ending.
Are you playing all barré chords? Because it doesn`t sound so metall-ish asit can be, like you don`t play with a pick but with your fingers and a bit muted. Maybe it will sound better if you can change that.

Could you give a quick look to or song Alcohol & Medicine? It`s in my sig....