Well, I'm new here, a friend told me about this place (Mike Milillo). To be honest, I don't know much about composition, but I do know a bit about Jazz. I kicked the hammond up and messed with the lead sheet a bit. IF I were playing this one, I'd probably "fix" a few chords along the way as I played, for example, I wouldn't play a B7 behind the Bb and Ab triplet there, and although we jazz guys like to let things unresolved a lot for endings, I'm not sure I'd have the guts to end this on a B9 chord. There's a rule us jazz guys have that goes soemthing like this, you can use any note any time as long as you have a reason for using it. I don't think I'm "out there" enough to have a "reason"to try and use the b9th to end this though. You did use a II-V right in the beginning there (Cmin-F) and somewhat with the D min-G, and you had a II-V-! right before the Am. THose definitely give it a jazz feel. And as far as the tritone objection above, I think you classical guys refer to that as "The Devil's Interval" if i'm remembering right? Us jazz guys use that all the time for a bit of tension, only we call it a flatted fifth.
I listened to the midi file, they are usually kind of stiff, it's hard to get jazz out of them. However, that piano only break was definitely swinging.