I think that you absolutely nailed the concept! I love the idea of platforming with the shotgun. Your other mechanics really support the shotgun as well. The platforms that do not let you jump as high mixed with the reload resetting on a kill makes for a fun experience. However, I think that the motion of the player needs a bit more work. The character feels a bit heavy and hard to control. Sometimes this causes you to fail the level even when you use the guns correctly. Overall I had fun with this game!