Love the feeling of the movement and shooting, it felt really smooth. But something that would go nicely with that would probably be to add some form of animation to the pheonix. It's a little hard to tell when you take damage, maybe some camera shake effect would be good. Also when you die the player is still able to move or shoot a little bit. Maybe it also gets a little repetitive when you start dying more and more and it resets all the way back to the first level. But in general, it is a cool atmosphere!