Your attempt at bossa nova is surely great! I think that some percussion other than the drums could be a good addition, maybe you can try experimenting with that. Regarding other comments, I think most of them can be answered by seeing your music as improvisation. The leading instruments, like the brasses, feel like they are in a conversation, which of course is not easily predictable. I like this aspect, it increases the jazziness of your music
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I think you're right, when you hear the brushed drum and the guitar, with the proper rhythm, it becomes immediately obvious that it's bossa nova. Do you know the band Soutaiseiriron? They mainly play rock, but one of my favorite songs from them is mixed with bossa nova style. It's called Sawayaka Kaishine. I think it's an interesting twist of the Bossa Nova genre, just like yours