Well the arrangement is a standout, I think most of us agree there. And you have clearly given the horns a lot of attention , and they are so well placed in the arrangement that had you not disclaimed them as "fake" that I probably wouldn't have noticed or cared.
Cool comparisons, the Dan, Chicago, and I'd add early Level 42 but no one really knows them so whatever the hell these days. :)
If I can venture outside the music and give you an overall song comment? I think in spots, you may have too many words going on. Lyrically it's quite dense with a lot of syllables coming at the listener in a short period of time. I have no real right to critique your word choices, as that's the personal expression of your idea here. But as a listener I was struggling a bit - the music wants to groove, and does! But in spots it's like the words were requiring a lot of attention to parse, and so the grooviness is not supported by the cadence of the lyrics.
For example, in the area :40 to :55 it's like you are singing a busy horn line. It's a good horn line, though! Also 2:20 - 2:35 ish.
That said, I liked your phrasing in the chorus a lot. The words in this part have a cool wrap-around thing going on
"You don't have to grieve Love you can get from Me I'm all you need Try to see through me All you mean to me " Just .02 from some hack in his mind palace. :)
Again, the arrangement is very creative, you nail the pop-jazz style. Absolutely keep 'em coming!
cheers,
-Tom