Will preface this by saying that I'm really bad at shmups, despite loving to make them and having one in-dev myself.
As soon as I saw the setting of the game I knew it was a must play solely for it and I was not disappointed - the cutscenes and the sound design are a very pleasing mix of cheesy and awesome, and more than I expected.
Anyway, I found this game to be rather very hard, but, I guess, that's just me being bad at such games. What would certainly help is some sort of a health bar - I do know it's not hard to just remember my health when I have only 3 health points (hope I got that right), but a visual indication is rarely a bad thing in such cases.
So far this game is aesthetics first, gameplay second, in my opinion, as the overall design felt far more fleshed out than the core gameplay, nevertheless, I had fun playing it and I hope you make something greater out of it!