Very stylish run-and-gun game! Loved the pixel art, the animation, and particularly the blood splatter effect on the levels.
Unfortunately, I'm not the best at these types of games - so I didn't make it too far.
I did notice though that I generally preferred the default weapon to any of the upgrades - as mashing the fire button let's you get a high fire rate without worrying about ammo or the spread of the shotgun.