I did find the music a little dull and repeative - it's not terrible but definately could be improved. I'd suggest adding more instruments - adding a bass line and percussion would make a big difference. Also consider extending the song the song with an additional section - most classic video game music has an intro followed by two or three distinguishable sections that repeat. Not that a game's music has to follow past conventions, but a bit of variety can help make an ok song sound great.
There was also a very noticable gap in the melody where it repeats. Ideally, it should not be too noticable when a song loops. A constant bass and percussion line would help with hiding the 'seams'.