I can tell you are a guitar player...
You have strong single note melody lines that remind me of the little solos and licks you'd hear from a guitar. You have a great sense of melody, that is for sure.
This piece of music has a lot of potential however it is drenched in noise and littered with errors here and there. I'll point out where you need to sharpen things up. I would have given this a 6 but those strong melodies that you used from time to time convinced me otherwise.
First of all the cymbal sample you used does not blend well with the piece and cuts through the mix. It needs to be a little more softer to exaggerate the slightly chilled/jammy feeling you have aimed for. Remember it's meant to be smooth jam.. not frozen jam.
Second of all there are parts where the piano track doesn't work and the notes you have used create a sound that is quite irritating. This occurs at 1:06 - 1:14 etc
Keep on working on sharpening up the music and watch out for errors such as at the end of the track, where there is a buzzing noise. This might be because you need to listen through to your track through better speakers/headphones. It's a buzzing that is very low in frequency.
In terms of composition I think this is very good yet I feel you could add another instrument here and there, perhaps a few guitar melodies to compliment the piano?
Anywho good work overall, be more careful and pay attention to detail :)
-MrMusicalLion