Super fun arcade scroller! some things i think that could be improved on or maybe changed. I personally felt that having your flap button right next to your fire button was just...idk it was a bit of a mindbender for me for some reason. I couldn't time my flapping and my gun firing enough to control going through corridors successfully.
I think the flap button should probably be on the Up arrow and then you should also add a Dive mechanic. Some instances it was just impossible to dodge both enemies and walls or whatever was coming at you because you could not drop fast enough.
you could also make the dive a skill thing too. you could have so they dive super fast or however you best feel fits to get through those tight squeezes.
Nice job!