A really great game! The art style is simply fantastic, sounds and music are great as well.
I had one problem with the gameplay, though - very often the enemies started to shoot me while still being very far off-screen, making it difficult to not only defeat them, but even to evade their fire. I found the only way to survive long-term was to be constantly moving and firing, but for some reason sometimes my bullets destroyed enemy projectiles and sometimes they passed straight through them. I guess reducing enemy engagement range and moving the camera further away to give you more screen space would solve a lot of these problems.
Other than that, I had a lot of fun with this one. It looks stunning, I love the way lighting and shadows work. Great job! ;)