Pretty solid game
Its a very well made game, it appears you put alot of effort into it. The mini-boss and boss battles are fun, and the voice acting adds a nice arcade feel.
To improve, I would suggest some buyable upgrades. The game feels a bit blank at some points and it would really get me more into it if I could buy missiles or triple lasers or something cool. You would of course have to make the levels harder, which by the way they are quite easy and not very challenging.
I look forward to your future games!