I finally finish it! I have to admit it was hard! The idea is cute even if a little bit stretched (pun intended), just a thought, but I think the game would be more engaging if you could jump by shooting or just jumping, both felt kinda confusing! Also since the collisions with the objects are on every side, it's easy to cheat, collide with the bottom of platforms and use it to propel yourself to the next platform completely avoiding the enemies!
That's said, it was fun :)