Hey man, great game! It's definitely one of the hardest games I have played lately, but it's also pretty fun. Whilst I'm not too on board with the art style, it has its charm, and is overall a pretty great experience. 4/5
Also, the bullet detection can be slightly off, you might want to check that out. It might lso be better to have an option, hidden in the menus perhaps, that lets you retry from each zone. That may lower the overall difficulty, but would be a fun "assist mode"