One control flaw hurts the score
Although you can use Up+Right at the same time to circle right, you somehow are not allowed at all to use Up+Left to circle left. That hurt me considerably.
I also wished there was a "Start From Boss" option as well as the ability to do it traditionally, respawn a life (halving score) from the point of death, instead of restarting, that was a drag.
I always loved these side-scrolling space shooters (like R-Type) as well as the top-scrolling ones ala Raiden. Good knockoff, but as always, add as many powerups and enemies as you can if you decide to make a sequel to this.