Pretty interesting concept, the controls are fine but personally I would like if there was crouching to duck under some enemy projectiles. I also really like the visuals.
So far my main grip is that if your game is about constantly shooting it's not a great idea to make all the platforms destructible, especially since there's only one way forward or rather upwards so you get stuck having to use the bullet casings to go up most of the time.
I still enjoyed and I hope you are able to sort out most of the weird level design issues because this game is cool as hell.