Awesome shmup, really great!
The issues I have with it so far, are, though, that the game is a bit lacking readability. It took me forever to find out where my amount of bombs is shown and what the bar on the left means (which means, I was not making calculated strategic decisions, but often just hoped for the best when pressing 'x').
I didn't understand at all what the green boxes are, but collected them anyway.
Also, giving the key binding away in the game itself is always a good idea (and be it as a simple display on the menu screen).
But I really enjoyed the playthrough, great job!