Hey, I like your composition a lot, too!
In addition to what EvieEmerald said, which is absolutely true (most of the tracks, especially the melody instruments, are in desperate need of some compression and maybe a more ‘aggressive’ eq, i mean, they are the parts which should stand out, right?):
The sax sounds too much VST-like, you hear the artificial vibrato very clearly, I think that’s quite problematic, kills the vibe for me a bit.
I think the (actually quite cool) drum programming could use a more ‘human’ approach too: it simply sounds too programmed at times.
Other than that, when mixed properly, this will be a stellar track.
Some compression tutorials:
https://www.youtube.com/watch?v=q4D6tDBsmWU (a general overview)
https://www.youtube.com/watch?v=s1U2hZHHFY0 (also a good general overview)
https://www.youtube.com/watch?v=RkeJqtJGn0I (from a certain company but nevermind, cool tutorial anyway)
https://www.youtube.com/watch?v=E2CxMCkvml8 (a good theoretical explanation)
Also quite important, when it comes to mixing: compare your track to other tracks you admire! Especially frequency-wise thereby you will detect your faults and maybe be able to correct them 