The movement and jump mechanics feel excellent, it's clear you know how to make a solid platformer. I feel the shooting mechanic doesn't support the platforming as strongly as it could. Maybe try making the projectile into a platform that the character can jump on? That might give the shooting mechanic a puzzle-like element and make it bit more compelling to the core gameplay loop. The visuals and mood are fantastic and I really like the attention to the small details, such as the dust cloud when he jumps and lands. Great work!