Something is a tad off on the pistol animation. Character is holding it too close to its body. Maybe straighten the right arm a little more. Other than that, everything else is coming along nicely.
I love the concept, and the controls seem pretty sharp. Lots of potential. Some simple sound effects would really add a lot to the game, and even a simple royalty free chiptune set on repeat would add even more. Overall, great first attempt, and I would love to see it fleshed out a bit more.