A couple things (I am a singer btw) I would say the doubles and harmonies need to be tightened up a little bit, and things are a little pitchy, so it makes it take away from your focus. On the harmonies, I would double them as well and through in either a vocal pad, under the chorus or pre chorus, think 2 singles ahh types notes following the music line. Also your pans are a little odd and make it sound a little confusing and unbalanced, this may tighten up if you tighten up the part them selves and that point could be moot. Also in the pre chorus spots try to use more inflection and movement to keep the verse and chorus more interesting. Just my 2 cents
PS I have worked on 100+ songs for videos games, commercials, radio songs etc and though I am not a producer, I have worked with some of the best, so I have picked up a couple cool things. Feel free to message me anytime man!