I suck at these types of games, I died constantly and got my first game over pretty quick. The game looks great, the transitions between screens/menus are really flavorful. Good music and good variation of enemies.
Don't have much negative to say, I just happen to suck at these types of games. The only really notable thing was when I entered a sort of corridor area and I had to avoid collision with the walls. In that area there were a some (at least one, I died at this point) vertical drops where the enemies were coming from the bottom and scaling it upwards. I died from colliding with an enemy, but with the screen pushing me forward and no ability to shoot up or down this seemed like a pretty dumb way to die.
Great game, very beautiful style.