Couple of quick comments:
- From a mixing perspective, I would turn down the melody and/or turn up the bassline.
The rest of these comments are things that are correct in the MIDI file I gave you, so please feel free to skim/compare them to the MIDI.
- Diddly-dums (four notes) during the first melody phrase, dum-de-dums (three notes) during the second.
- The first note of the bridge should be down a tone (starts on A instead of B).
A few other little niggles, but the littler they are, the harder they become to explain via text. It's all in the MIDI.
All in all, great for a first effort. You'll quickly improve!