I love the art style! The controls are a bit awkward, and I ended up accidentally moving my cursor off of the game screen briefly, which ended up resulting in some damage, so it might be good to put the joystick a little further from the edge of the screen. Also, the arrows move extremely slowly and often miss because enemies move past the line of fire too quickly. Overall though the game is good, and I love the concept for it.
Also I ran into a (I think) bug where the arrows took up about half of the screen (the sprites got scaled up) for a few shots.