I see you've done something very interesting. I believe you use 5 measures of 4/4 in one 'theme' instead of the common 4. After the 5, you repeat. This made me at first confused about the rhythm (starting at 0:40 especially, but later at 2:00 as well (but using 2/4).
The song sounds great, and the composition is nice and simple! I wouldn't say it would fit most towns (but who knows, maybe an eerie stealthy town?), but it does really fit the firefly theme! Overall, nice entry :)