Nice work on the alto sax!

When the guitar solo comes in, it's much lower than the sax. You might want to boost the volume a bit. I turned the volume up on my speakers, and then the sax came back in, and I had to turn the volume down again.
I like the M1 piano doubling the sax, but since it sounds a lot like a vibraphone, I wonder if you'd considered that instead. The M1 has some really nice vibes.
Nothing else I could suggest - the mix sounds great on my speakers, with the sax front and center and the rest of the instruments supporting and staying out of the way, but still sounding interesting in the process.
And before I forget - nice composition, too!