I have listened to this multiple times - my thoughts are below. I recognise the time, effort and talent you have put into this. Sorry if you feel any of the negative comments are harsh or unjustified. Thanks a lot for posting the song.
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Sounds like a pretty generic slow minor blues, well written and played but lacking any distinctive features or defining hook.
Yes, clearly a minor key blues. Some blues songs have hooks, most do not.
I’m finding the chord progressions a little too predictable.
As we have already established, this is a minor key blues. Blues, true traditional blues anyway, use a predictable chord progression, period.
The lyric does nothing for me – but this could be down to the delivery.
Fair enough, to each his own.
Instrumentation
Really nice tone on the lead guitar
Vocals
Singing is ok – perhaps not the best voice for this type of song.
Man, if you think her vocal is just ok you must have a hole in your soul

Happy you liked the tone on the guitar.
Mix / Production
Generally nice balanced mix apart from at 2:02 where it sounds for all the world like that lead gtr is stepping in for a huge solo – if this is just lead gtr playing during the verse it sounds to me way too loud and intrusive. The lead vox practically disappear at this point!
The entire song builds to a climax at 2:02, however the guitar could possibly come down a couple of db's, I'll give you that.
What could be improved
Also it sounds like there is a glitch in the opening gtr solo at 00:18
There is no glitch in the opening guitar.
The chord sequence is ok but slightly too predictable
We have already covered this. Minor key blues, remember?
Piano solo at 2:20 to 3:00 – not the best instrument for this type of song and the solo introduces way too much dissonance. Was it played or generated? If I were producing I would dispense with it entirely and leave just the gtr solo which cuts through more effectively but still sounds to me like it could be further developed.
Not the best instrument for this type of song?! There are many, many examples of pianos being used in blues. I like the contrast and feel that it sets up the guitar solo that follows.
You ask if it was played, if you had bothered to read the song description you would have seen that all the guitar tracks, the piano, and the bass are all played.
I'm sorry you feel the guitar solo could be further developed, but I like it just the way it is

You clearly know very little about blues and are not a blues fan. So why bother to listen to the song? Just to let me know you don't like blues?