1. on the sprites you cut of some top parts of the skull (the left view of the gun and the top view as i saw it now)
2. when walking, the down and up view is somewhat weird. the gun isnt moving smoothly in my opinion
3. when shooting:
- top view: you should have the head go back, not the body
- down view: the player is not moving at all. also here maybe have the head go up a little bit?
- generally: id not have the player move, rather have the gun go back a little bit and move the arms back aswell; the shooting shouldnt be looped; while shooting, id always add a small frame where the blast sprites are gone than or use the 'setbackto' to the idle gani


but it does look very nice, just some things which could be fixed ^^