Very original concept ! I love the art style and the setting of the game, it looks great. Thank you for putting the hitbox on the sprite too :P
It took me a couple of tries to understand properly how the game works and how it controls (with the weapon switching and bullet absorbing). I struggled a bit with the parry, I felt like the timing to absorb the bullet was a big tight when the screen gets filled with stuff, I found myself getting hit a lot.
I'd love to see how it would feel if the parry would last a little longer on screen before retracting, to give us time to absorb more bullets and shield ourselves when in danger. Just a brainstorm idea!
It would probably feel great with gamepad controls too!
Good job on the submission I liked your game!