Nice little game. Enjoyed the graphic style and presentation, nice audio and the gameplay felt quite unique for a Shmup style game.
I kind of wish there was more strategy with the vertical positioning of the player in relation to the enemies(eg, right now if you go above enemies neither of you are able to hit each other). Also maybe the game-play could be a bit quicker, though I think adding more gameplay possibilities with that vertical axis could significantly speed up the game by default.