The song was ruined by the vocals. They were too nasally, restrained and off-key. In order to add some more dynamics to the singing you really need to belt it and not be so timid. Don't tense up and let the sound carefully creep through your mouth and nose. Rather, belt it from your gut and carefully listen to what tensing up different parts of you does to your voice and relax the parts that are having an adverse effect on it. It can be your face, your nasal passage, your mouth, your vocal chords, your chest, or gut. Just pay careful attention, tune into your good singing stance and belt it.