the way I used to rate in another Gamejam (as in my first jam some months ago).
topic: music
no music :2/5
music (as in a sound): 3/5
something that sound a bit decent: 4/5
I will remember your music the day after/remember your game when I hear the music (in a good way): 5/5
for me you will quit fast hit the 4/5. If I have the feeling you did your best, and did your best to make something fitting the theme/situation you deserve a 4/5. Most people here are not professionals, and do this for fun-in their spare time. So if I have the feeling you enjoyed making this and put some time in it you deserve a nice rating.
*edit, grammar mistake*