Beautifully presented and very complete. This is a good concept, but do I detect a little lie claiming it fires on the beat?! Seems like it shoots at regular intervals to me, that just happen to line up with the beats. Like if you put a different track behind it, it would still just shoot at regular times.
That aside, it's well made! Juicy and polished. I feel some gameplay tweaks might be necessary. The green ghosts move so fast and take so many shots, if you encounter one while running from another you're basically guaranteed to take a hit. If you could maybe zoom out a bit, or it showed an indicator at the edge of the screen you might be able to plan for them, but as it stands you get mugged by them more often than not. Feels a little unfair.
Perhaps if you build up a bigger combo the reward is a more powerful gun, although that could lead to unbalanced play too. One hit could ruin an otherwise great run.
Well done for turning out a really well polished game in a short time, though!