I feel like the usage of the theme might be a little weak here, but other than that, really good stuff
The visuals are amazing, however I feel like they make the bullets very hard to actually see. I had to squint just to see them at times
The actual boss designs were cool though. So far I've managed to get till the 3rd boss
Audio as a whole is great as well. ( Could you post that main menu theme for download ? It's really great lol )