I enjoyed it. The sprites are quite alright, the fx is quite satisfying. Mechanically, I think that the dragon's hitbox might be a bit large, so you have a hard time reacting to the balista shots.
Also, there's a little bug that makes it so that if you collide against the side of the screen you'll move ahead at incredible speeds, but it doesn't hamper enjoyment at all tbh. Solid little shooter!