Thank you so much for this great comment and your feedback!! As soon as I have a moment, I'll take a look at this bug, which seems to be quite persistent, since I had already noticed it and thought I had fixed it...
Did you do this all by yourself? It's so impressive! The design (and music too) is splendid; I've rarely seen such masterful pixel art. You've created a game that ranks among the very best shoot 'em ups on 8-bit systems, easily surpassing games made on much more powerful systems.
