Had a lot of fun playing this - while the theme is not really pronounced, everything else is very well done. Music and gun shot sounds were great, would have liked some sounds when the player lost HP as well.
Art-style was very consistent and clear, very nice.
But the big star here is the gameplay, it's very smooth and very enjoyable. The map is well-laid out, shooting enemies is fun, and I enjoyed my play.
Great stuff, best of luck!