Wow, really loved the theme and story - though the ending T_T. Art was clean and I really loved the visual / audio representation of the players health.
If I could change/add anything - it'd love for there to be a few more sound effects on things such as shooting ext. Also, the enemies that shoot really do so quite quickly - while it did add to the challenge I feel it took away a little from the vibe when I had to slow my roll and really time things - though this is a very subjective opinion. I think slowing them down a little, and perhaps mixing up the pattern on some might be cool!
With that said, really excellent work all up!