the voice is prety much the main thing that needs work. this sounds to me like it is meant for a more melodic tone in the voice. right now it sounds like the singer is bringing the band down. one thing you can do to to improve it is plug the mic into an effects pedal and get its tone as close to the scale of the rythum guitar. of course thats the cheaper / lazier way to help improve but also cool because you can then experiment and add some new tripy sounds with it. the other idea is get some classes for vocal so you dont sound as flat. other than that every thing else sounds great to me.